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>
cancel-in-progress: false queues new runs so the single mac mini
runner doesn't fight itself when pushes stack during rebases or
cross-PR contention. Existing e2e-api.yml already has this pattern.
Fixes: 19 queued runs on single self-hosted runner (02:55 UTC snapshot)
Co-authored-by: Molecule AI Fullstack (floater) <fullstack-floater@agents.moleculesai.app>
GitHub's UI-configured "Code quality" scan only fires on the default
branch (staging), which leaves every staging→main promotion PR
unscanned. The "On push and pull requests to" field in the UI has no
dropdown; multi-branch scanning on private repos without GHAS isn't
available there.
Workflow file gives us the control we can't get in the UI: triggers
on push + pull_request for both branches. Runs on the same
self-hosted mac mini via [self-hosted, macos, arm64].
upload: never — GHAS isn't enabled on this repo so the SARIF upload
API 403s. Keep results locally, filter to error+warning severity,
fail the PR check on findings, publish SARIF as a workflow artifact.
Flipping upload: never → always after GHAS is enabled (if ever) is
a one-line change.
Picks up the review-flagged improvements from the earlier closed PR:
- jq install step (brew, no assumption it's present)
- severity filter (error+warning only, drops noisy note-level)
- set -euo pipefail
- SARIF glob (file name doesn't match matrix language id)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
