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Alexandru Dima 37e7e85b10 Optimize node_modules caching for CI & PR checks (#322074)
* CI: speed up node_modules cache with zstd + shared scripts

Switch the Linux/macOS node_modules cache from single-threaded gzip
(tar -czf) to multi-threaded zstd. The "Create node_modules archive"
step was spending ~5min of single-core gzip on a multi-GB tree on every
cache miss; zstd -T0 uses all cores and decompresses much faster, so
cache-hit jobs benefit too. Windows stays on 7-Zip (already threaded).

Extract the archive/extract commands into shared per-platform scripts
under .github/workflows/node_modules_cache/ (cache.sh / cache.ps1, each
dispatching on an archive|extract argument) so the format and flags live
in one place instead of being duplicated across ~8 workflows. Bump
build/.cachesalt to invalidate existing gzip caches.

Also remove the obsolete extensions/copilot CI workflows
(copilot-setup-steps.yml, ensure-node-modules-cache.yml, pr.yml) and the
unused build/listBuildCacheFiles.js, and drop their now-stale entries
(plus lit-html and signals-core) from .eslint-allowed-javascript-files.

* ci: seed copilot node_modules cache on main and rename cache keys

Add copilot-linux and copilot-windows jobs to pr-node-modules.yml so the
copilot node_modules cache is populated on main. Rename the copilot cache
keys to copilot-node_modules-linux / copilot-node_modules-windows in pr.yml.

* ci: extract node_modules cache into composite actions

Factor the repeated node_modules cache plumbing into two local composite
actions, restore-node-modules and save-node-modules, and migrate all
workflows that used the cache.sh/cache.ps1 archive flow (pr, pr-node-modules,
pr-{linux,darwin,win32}-test, copilot-setup-steps, component-fixtures,
css-order-scan).

- restore-node-modules computes the key, restores the cache, optionally
  extracts on a hit, and exports the resolved key via $GITHUB_ENV.
- save-node-modules archives node_modules and saves it to the cache, reusing
  the key exported by restore so callers don't repeat the prefix.
- Bespoke install steps stay in the workflows, so per-job env/secrets never
  cross the action boundary.
- Only seed the cache on branch pushes (component-fixtures skips PRs, whose
  caches aren't shared).

* save the node_modules cache for now to test it

* ci: fix node_modules cache save dropping the archive

cache.sh wrote its archive as cache.tzst, but actions/cache reserves that
name for its own tarball and passes --exclude cache.tzst, so our archive was
excluded and an empty (~200 B) cache was saved on Linux/macOS. Rename the
archive to node-modules.tzst and bump build/.cachesalt to invalidate the
broken cache entries.

* empty commit

* Remove again saving to the node modules cache from PR steps
2026-06-19 17:21:43 +02:00
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