feat(fetch): add fetch-mode to work around HuggingFace clone failures (bug 2047876) - #1046

[taskcluster 2026-09-22T16:48:28.559Z] Worker Type (mozilla-t/pre-commit) settings:
[taskcluster 2026-09-22T16:48:28.559Z]   {
[taskcluster 2026-09-22T16:48:28.559Z]     "generic-worker": {
[taskcluster 2026-09-22T16:48:28.559Z]       "config": {
[taskcluster 2026-09-22T16:48:28.559Z]         "capacity": 1,
[taskcluster 2026-09-22T16:48:28.559Z]         "headlessTasks": true
[taskcluster 2026-09-22T16:48:28.559Z]       },
[taskcluster 2026-09-22T16:48:28.559Z]       "engine": "multiuser",
[taskcluster 2026-09-22T16:48:28.559Z]       "go-arch": "amd64",
[taskcluster 2026-09-22T16:48:28.559Z]       "go-os": "linux",
[taskcluster 2026-09-22T16:48:28.559Z]       "go-version": "go1.27.1",
[taskcluster 2026-09-22T16:48:28.559Z]       "release": "https://github.com/taskcluster/taskcluster/releases/tag/v108.1.0",
[taskcluster 2026-09-22T16:48:28.559Z]       "revision": "f86624a8bf3761cdbc48de2c7f74bae44d7464dd",
[taskcluster 2026-09-22T16:48:28.559Z]       "source": "https://github.com/taskcluster/taskcluster/commits/f86624a8bf3761cdbc48de2c7f74bae44d7464dd",
[taskcluster 2026-09-22T16:48:28.559Z]       "version": "108.1.0"
[taskcluster 2026-09-22T16:48:28.559Z]     },
[taskcluster 2026-09-22T16:48:28.559Z]     "image": "projects/taskcluster-imaging/global/images/gw-fxci-gcp-l1-2404-amd64-headless-googlecompute-2026-09-09",
[taskcluster 2026-09-22T16:48:28.559Z]     "instance-id": "2165053958502944732",
[taskcluster 2026-09-22T16:48:28.559Z]     "instance-type": "projects/887720501152/machineTypes/c3d-standard-4",
[taskcluster 2026-09-22T16:48:28.559Z]     "local-ipv4": "10.138.0.131",
[taskcluster 2026-09-22T16:48:28.559Z]     "project-id": "fxci-production-level1-workers",
[taskcluster 2026-09-22T16:48:28.559Z]     "public-hostname": "mozilla-t-pre-commit-ktlb-g-utlcxbazonaojuw.c.fxci-production-level1-workers.internal",
[taskcluster 2026-09-22T16:48:28.559Z]     "public-ipv4": "34.169.212.214",
[taskcluster 2026-09-22T16:48:28.559Z]     "region": "us-west1",
[taskcluster 2026-09-22T16:48:28.559Z]     "zone": "us-west1-b"
[taskcluster 2026-09-22T16:48:28.559Z]   }
[taskcluster 2026-09-22T16:48:28.559Z] Task ID: Si1NJra6Se6F0qIYcoHPLA
[taskcluster 2026-09-22T16:48:28.559Z] === Task Starting ===
[taskcluster 2026-09-22T16:48:29.186Z] [mounts] No existing writable directory cache 'lint-pre-commit-uv-v1' - creating /home/generic-worker/caches/EyJ0KrBeRl2GvHlLMw17oA
[taskcluster 2026-09-22T16:48:29.186Z] [mounts] Creating directory /home/task_Si1NJra6Se6F0_0/cache0
[taskcluster 2026-09-22T16:48:29.201Z] [mounts] Successfully mounted writable directory cache '/home/task_Si1NJra6Se6F0_0/cache0'
[taskcluster 2026-09-22T16:48:29.201Z] [mounts] No existing writable directory cache 'lint-pre-commit-repos-v1' - creating /home/generic-worker/caches/L8TFv8NHRuaG5K3GEY7GlQ
[taskcluster 2026-09-22T16:48:29.201Z] [mounts] Creating directory /home/task_Si1NJra6Se6F0_0/cache1
[taskcluster 2026-09-22T16:48:29.212Z] [mounts] Successfully mounted writable directory cache '/home/task_Si1NJra6Se6F0_0/cache1'
[taskcluster 2026-09-22T16:48:29.212Z] [mounts] No existing writable directory cache 'lint-pre-commit-checkout-taskcluster-taskgraph-v1' - creating /home/generic-worker/caches/fKV9SFDeTGGJhtY4UWI0xg
[taskcluster 2026-09-22T16:48:29.212Z] [mounts] Creating directory /home/task_Si1NJra6Se6F0_0/cache2
[taskcluster 2026-09-22T16:48:29.223Z] [mounts] Successfully mounted writable directory cache '/home/task_Si1NJra6Se6F0_0/cache2'
[taskcluster 2026-09-22T16:48:29.223Z] [d2g] Loading docker image
[taskcluster 2026-09-22T16:48:35.005Z] [d2g] Loaded docker image "docker.io/mozillareleases/taskgraph:run-task-v24.1.1@sha256:9b9a1a3ca42025bb8d7eba19e1b8759f04504097265074df25bbc997bd802543"
[taskcluster 2026-09-22T16:48:35.008Z] Executing command 0: docker run -t --name taskcontainer_fZnWeahuRMuRiTECUTMa0A --memory-swap -1 --pids-limit -1 --pull=never --log-driver=none '--add-host=localhost.localdomain:127.0.0.1' -v '/home/task_Si1NJra6Se6F0_0/cache0:/builds/worker/.cache/uv' -v '/home/task_Si1NJra6Se6F0_0/cache1:/builds/worker/.cache/pre-commit' -v /home/task_Si1NJra6Se6F0_0/cache2:/builds/worker/checkouts --network gw-task-Si1NJra6Se6F-0 '--add-host=taskcluster:172.18.0.1' --env-file 'env.list' -- 'mozillareleases/taskgraph:run-task-v24.1.1@sha256:9b9a1a3ca42025bb8d7eba19e1b8759f04504097265074df25bbc997bd802543' run-task --src-checkout=/builds/worker/checkouts/src --task-cwd=/builds/worker/checkouts/src -- bash -c 'uv tool install pre-commit && /builds/worker/.local/bin/pre-commit run --all-files'
[setup 2026-09-22T16:48:37.873+00:00] run-task started in /
[setup 2026-09-22T16:48:37.873+00:00] Invoked by command: --src-checkout=/builds/worker/checkouts/src --task-cwd=/builds/worker/checkouts/src -- bash -c uv tool install pre-commit && /builds/worker/.local/bin/pre-commit run --all-files
[setup 2026-09-22T16:48:37.873+00:00] Python version: 3.13.5
[setup 2026-09-22T16:48:37.873+00:00] Subprocess python version: 
cpython-3.13.5-linux-x86_64-gnu    /usr/bin/python3.13
cpython-3.13.5-linux-x86_64-gnu    /usr/bin/python3 -> python3.13
[cache 2026-09-22T16:48:37.962+00:00] cache /builds/worker/.cache/uv is empty; writing requirements: gid=1000 uid=1000 version=1
[cache 2026-09-22T16:48:37.962+00:00] cache /builds/worker/.cache/pre-commit is empty; writing requirements: gid=1000 uid=1000 version=1
[cache 2026-09-22T16:48:37.963+00:00] cache /builds/worker/checkouts is empty; writing requirements: gid=1000 uid=1000 version=1
[setup 2026-09-22T16:48:37.963+00:00] running as worker:worker
[vcs 2026-09-22T16:48:37.963+00:00] executing ['git', 'config', '--global', '--add', 'safe.directory', '/builds/worker/checkouts/src']
[vcs 2026-09-22T16:48:37.965+00:00] executing ['git', 'clone', 'https://github.com/JohanLorenzo/taskgraph', '/builds/worker/checkouts/src']
[vcs 2026-09-22T16:48:37.966+00:00] Cloning into '/builds/worker/checkouts/src'...
[vcs 2026-09-22T16:48:38.864+00:00] executing ['git', 'fetch', 'https://github.com/JohanLorenzo/taskgraph', 'bug-2047876']
[vcs 2026-09-22T16:48:39.190+00:00] From https://github.com/JohanLorenzo/taskgraph
[vcs 2026-09-22T16:48:39.190+00:00]  * branch            bug-2047876 -> FETCH_HEAD
[vcs 2026-09-22T16:48:39.196+00:00] executing ['git', 'checkout', '-f', '-B', 'bug-2047876', '276f0f270bb2cf70abb4dd40c92d99688133bdb3']
[vcs 2026-09-22T16:48:39.225+00:00] Switched to a new branch 'bug-2047876'
[vcs 2026-09-22T16:48:39.227+00:00] cleaning git checkout...
[vcs 2026-09-22T16:48:39.227+00:00] executing ['git', 'clean', '-nxdff']
[vcs 2026-09-22T16:48:39.230+00:00] removing []
[vcs 2026-09-22T16:48:39.230+00:00] successfully cleaned git checkout!
[vcs 2026-09-22T16:48:39.232+00:00] TinderboxPrint:<a href='https://github.com/JohanLorenzo/taskgraph/commit/276f0f270bb2cf70abb4dd40c92d99688133bdb3' title='Built from taskgraph commit 276f0f270bb2cf70abb4dd40c92d99688133bdb3'>276f0f270bb2cf70abb4dd40c92d99688133bdb3</a>
[setup 2026-09-22T16:48:39.232+00:00] UV_CACHE_DIR is /builds/worker/.cache/uv
[task 2026-09-22T16:48:39.232+00:00] executing ['bash', '-c', 'uv tool install pre-commit && /builds/worker/.local/bin/pre-commit run --all-files']
[task 2026-09-22T16:48:39.419+00:00] Resolved 10 packages in 134ms
[task 2026-09-22T16:48:39.458+00:00] Downloading virtualenv (5.2MiB)
[task 2026-09-22T16:48:39.552+00:00]  Downloading virtualenv
[task 2026-09-22T16:48:39.552+00:00] Prepared 10 packages in 132ms
[task 2026-09-22T16:48:39.557+00:00] warning: Failed to hardlink files; falling back to full copy. This may lead to degraded performance.
[task 2026-09-22T16:48:39.557+00:00]          If the cache and target directories are on different filesystems, hardlinking may not be supported.
[task 2026-09-22T16:48:39.557+00:00]          If this is intentional, set `export UV_LINK_MODE=copy` or use `--link-mode=copy` to suppress this warning.
[task 2026-09-22T16:48:39.574+00:00] Installed 10 packages in 21ms
[task 2026-09-22T16:48:39.574+00:00]  + cfgv==3.5.0
[task 2026-09-22T16:48:39.574+00:00]  + distlib==0.4.3
[task 2026-09-22T16:48:39.574+00:00]  + filelock==4.0.1
[task 2026-09-22T16:48:39.574+00:00]  + identify==2.6.19
[task 2026-09-22T16:48:39.574+00:00]  + nodeenv==1.10.0
[task 2026-09-22T16:48:39.575+00:00]  + platformdirs==4.11.12
[task 2026-09-22T16:48:39.575+00:00]  + pre-commit==4.6.2
[task 2026-09-22T16:48:39.575+00:00]  + python-discovery==1.6.1
[task 2026-09-22T16:48:39.575+00:00]  + pyyaml==6.0.3
[task 2026-09-22T16:48:39.575+00:00]  + virtualenv==21.10.0
[task 2026-09-22T16:48:39.576+00:00] Installed 1 executable: pre-commit
[task 2026-09-22T16:48:39.576+00:00] warning: `/builds/worker/.local/bin` is not on your PATH. To use installed tools, run `export PATH="/builds/worker/.local/bin:$PATH"` or `uv tool update-shell`.
[task 2026-09-22T16:48:39.785+00:00] [INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
[task 2026-09-22T16:48:40.639+00:00] [INFO] Initializing environment for https://github.com/astral-sh/ruff-pre-commit.
[task 2026-09-22T16:48:41.129+00:00] [INFO] Initializing environment for https://github.com/astral-sh/uv-pre-commit.
[task 2026-09-22T16:48:41.656+00:00] [INFO] Initializing environment for https://github.com/adrienverge/yamllint.git.
[task 2026-09-22T16:48:42.342+00:00] [INFO] Initializing environment for https://github.com/codespell-project/codespell.
[task 2026-09-22T16:48:43.128+00:00] [INFO] Initializing environment for https://github.com/compilerla/conventional-pre-commit.
[task 2026-09-22T16:48:43.719+00:00] [INFO] Installing environment for https://github.com/pre-commit/pre-commit-hooks.
[task 2026-09-22T16:48:43.719+00:00] [INFO] Once installed this environment will be reused.
[task 2026-09-22T16:48:43.719+00:00] [INFO] This may take a few minutes...
[task 2026-09-22T16:48:46.636+00:00] [INFO] Installing environment for https://github.com/astral-sh/ruff-pre-commit.
[task 2026-09-22T16:48:46.636+00:00] [INFO] Once installed this environment will be reused.
[task 2026-09-22T16:48:46.636+00:00] [INFO] This may take a few minutes...
[task 2026-09-22T16:48:49.709+00:00] [INFO] Installing environment for https://github.com/astral-sh/uv-pre-commit.
[task 2026-09-22T16:48:49.709+00:00] [INFO] Once installed this environment will be reused.
[task 2026-09-22T16:48:49.709+00:00] [INFO] This may take a few minutes...
[task 2026-09-22T16:48:53.676+00:00] [INFO] Installing environment for https://github.com/adrienverge/yamllint.git.
[task 2026-09-22T16:48:53.676+00:00] [INFO] Once installed this environment will be reused.
[task 2026-09-22T16:48:53.676+00:00] [INFO] This may take a few minutes...
[task 2026-09-22T16:48:56.460+00:00] [INFO] Installing environment for https://github.com/codespell-project/codespell.
[task 2026-09-22T16:48:56.460+00:00] [INFO] Once installed this environment will be reused.
[task 2026-09-22T16:48:56.460+00:00] [INFO] This may take a few minutes...
[task 2026-09-22T16:49:00.281+00:00] trim trailing whitespace.................................................Passed
[task 2026-09-22T16:49:00.352+00:00] fix end of files.........................................................Passed
[task 2026-09-22T16:49:00.480+00:00] check yaml...............................................................Passed
[task 2026-09-22T16:49:00.556+00:00] check for added large files..............................................Passed
[task 2026-09-22T16:49:00.596+00:00] ruff (legacy alias)......................................................Passed
[task 2026-09-22T16:49:00.638+00:00] ruff format..............................................................Passed
[task 2026-09-22T16:49:00.825+00:00] uv-lock..................................................................Passed
[task 2026-09-22T16:49:01.057+00:00] yamllint.................................................................Passed
[task 2026-09-22T16:49:01.278+00:00] codespell................................................................Passed
[taskcluster 2026-09-22T16:49:02.714Z]                        Exit Code: 0
[taskcluster 2026-09-22T16:49:02.714Z]                        User Time: 16.894ms
[taskcluster 2026-09-22T16:49:02.714Z]                      Kernel Time: 15.955ms
[taskcluster 2026-09-22T16:49:02.714Z]                        Wall Time: 27.705770597s
[taskcluster 2026-09-22T16:49:02.714Z]  Average Available System Memory: 14.44 GiB
[taskcluster 2026-09-22T16:49:02.714Z]       Average System Memory Used: 1.17 GiB
[taskcluster 2026-09-22T16:49:02.714Z]          Peak System Memory Used: 1.39 GiB
[taskcluster 2026-09-22T16:49:02.714Z]              Total System Memory: 15.61 GiB
[taskcluster 2026-09-22T16:49:02.714Z]                           Result: SUCCEEDED
[taskcluster 2026-09-22T16:49:02.714Z] === Task Finished ===
[taskcluster 2026-09-22T16:49:02.714Z] Task Duration: 27.706477287s
[taskcluster 2026-09-22T16:49:02.767Z] [mounts] Preserving cache: Moving "/home/task_Si1NJra6Se6F0_0/cache0" to "/home/generic-worker/caches/EyJ0KrBeRl2GvHlLMw17oA"
[taskcluster 2026-09-22T16:49:02.767Z] [mounts] Preserving cache: Moving "/home/task_Si1NJra6Se6F0_0/cache1" to "/home/generic-worker/caches/L8TFv8NHRuaG5K3GEY7GlQ"
[taskcluster 2026-09-22T16:49:02.767Z] [mounts] Preserving cache: Moving "/home/task_Si1NJra6Se6F0_0/cache2" to "/home/generic-worker/caches/fKV9SFDeTGGJhtY4UWI0xg"