molecule-core is a public repo — GHA-hosted minutes are free. The
self-hosted Mac mini was only in play to dodge GHA rate limits
(memory feedback_selfhosted_runner), but for these specific
workflows it came with real costs:
- Docker-push workflows emulated linux/amd64 from arm64 via QEMU —
every canvas + platform image build ran ~2-3x slower than native.
- Six PRs worth of keychain-avoidance hacks in publish-* because
`docker login` on macOS writes to osxkeychain unconditionally,
and the Mac mini's launchd user-agent keychain is locked.
- Homebrew pin-down environment variables (HOMEBREW_NO_*) sprinkled
everywhere to work around the shared /opt/homebrew symlink mess
on the runner.
- Setup-python@v5 couldn't write to /Users/runner, so ci.yml
python-lint resorted to a hand-rolled Homebrew python3.11 dance.
- Single runner → fan-out contention; CodeQL's 45-min analysis
fought the canvas publish for the one slot.
Changes across the 7 workflows:
- runs-on: [self-hosted, macos, arm64] → ubuntu-latest (every job)
- publish-canvas-image + publish-workspace-server-image:
drop the hand-rolled auths-map step + QEMU setup + buildx v4
→ docker/login-action@v3 + setup-buildx@v3. Linux + amd64
target = native build.
- canary-verify + promote-latest: replace `brew install crane` +
HOMEBREW_NO_* incantations with imjasonh/setup-crane@v0.4.
- codeql.yml: drop `brew install jq` — jq is preinstalled on
ubuntu-latest.
- ci.yml shellcheck: drop the self-hosted existence check —
shellcheck is preinstalled via apt.
- ci.yml python-lint: replace the Homebrew python3.11 path dance
with actions/setup-python@v5 (which works fine on GHA-hosted),
add requirements.txt caching while we're there.
- Remove stale comments referencing "the self-hosted runner",
"Mac mini", keychain, osxkeychain etc.
The self-hosted Mac mini remains in service for private-repo
workflows only. Memory feedback_selfhosted_runner updated to
reflect the public-repo scope carve-out.
Net -96 lines across the 7 files.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
CI now detects which paths changed and skips irrelevant jobs:
- Platform (Go): only runs when platform/** changes
- Canvas (Next.js): only runs when canvas/** changes
- Python Lint: only runs when workspace-template/** changes
- Shellcheck: only runs when tests/e2e/** or scripts/** change
- E2E API: only runs when platform/** or tests/e2e/** change
Docs-only PRs (*.md, docs/**) skip all 5 jobs, saving ~15 min of
runner time per PR. Uses dorny/paths-filter for the CI workflow and
native paths: filter for the E2E workflow.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Job-level `concurrency.cancel-in-progress: false` only prevents sibling jobs
from killing each other — it does not protect the parent workflow run from
being cancelled when a new push arrives. Every PR push was cancelling the
in-progress E2E run, forcing manual `gh run rerun` across 7+ active PRs.
Fix: move e2e-api into `.github/workflows/e2e-api.yml` with a workflow-level
concurrency group (`e2e-api-${{ github.ref }}`, cancel-in-progress: false).
New pushes now queue behind the running E2E job instead of cancelling it.
Fast jobs (platform-build, canvas-build, shellcheck, python-lint) stay in
ci.yml and retain normal run-level cancellation for quick iteration feedback.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
