fix(ci): run E2E matrix when CI workflow definitions change

[Simone319]

The gap

pr-checks.yml's Detect Changes job gates every expensive E2E job (E2E Templates, E2E Sandbox, E2E Sandbox (VPC Smoke), E2E Production, E2E Supabase, E2E Hosting (...) matrix, Telemetry E2E) on needs.detect-changes.outputs.source-changed == 'true'. That output came from:

git diff --name-only origin/main...HEAD | grep -qE '^(packages|test-apps)/'

So a PR that only edits .github/workflows/** produced source-changed=false and the entire E2E matrix was skipped (and the Build and Test gate treats skipped E2E jobs as passing).

That is how PRs #465/#466 (commits 327f061 / 7401d30) changed CI behaviour — turning stale-stack reuse into fresh CREATEs in cleanup-stacks.yml — without a single E2E job ever running against the new behaviour. The resulting hosting regression (aws-cdk#15891 class) only surfaced later on #391/#460/#459.

The fix

Treat CI-definition changes that actually affect the E2E jobs as source changes:

• .github/workflows/pr-checks.yml — the workflow defining the E2E jobs themselves
• .github/workflows/cleanup-stacks.yml — the stale-stack cleanup that determines whether E2E deploys reuse or freshly CREATE stacks
• .github/actions/ — composite actions the E2E jobs uses: (e.g. seed-telemetry-id)

Alternative considered

A blanket .github/workflows/** rule. Rejected: it would run the full, expensive E2E matrix (6-way hosting matrix + sandbox/production/supabase/telemetry AWS deploys) on every unrelated workflow edit — issue triage, publishing, docs bots, stale-issue lockers. The explicit list is the minimal set that actually influences E2E outcomes.

Notes

• Diff touches only .github/workflows/pr-checks.yml — nothing under packages/, so no changeset is required (changeset-guard only tracks ^packages/([^/]+)/).
• YAML parses cleanly; regex verified against sample paths (matches packages/, test-apps/, the two workflows, .github/actions/; does not match e.g. lock.yml or README.md).
• This PR itself edits pr-checks.yml, so it should now self-trigger the E2E matrix — a live demonstration of the fix.

[changeset-bot]

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