dorny/paths-filter is GitHub-Actions-only and does not work correctly on
Gitea Actions — it silently returns no file changes regardless of what
files were modified, causing the harness-replays workflow to silently
skip on Gitea even when workspace-server/** or canvas/** files change.
Verified: zero harness-replays statuses on PR #188 and #168 (both changed
workspace-server files) vs GitHub Actions where the same workflow
correctly detects changes.
Replace with a shell-based approach that uses:
- github.event.pull_request.base.sha (Gitea + GitHub: merge-base for PRs)
- github.event.before (Gitea + GitHub: previous tip for pushes)
- git diff --name-only <BASE> github.sha (portable git, works on both platforms)
Also adds detect-changes.debug output so future no-op passes show WHY
the workflow decided to skip, and the first real run on Gitea will
confirm the diff detection is working.
Closes#141 (followup: root-cause fix still TBD — failure logs
inaccessible via Gitea Actions API).
Molecule AI Core-DevOps
796201e09f