The detect-changes step's push path used `echo '${{ toJSON(github.event.commits) }}'`
which broke on every main push because every main commit is a Gitea merge commit
whose message contains single quotes (e.g. "Merge pull request 'fix: ...' from branch
into main"). The embedded `'` ended the single-quoted bash string mid-JSON, and a
subsequent `(` (e.g. in "#523)") was parsed as a subshell → "syntax error near
unexpected token `('". This caused detect-changes to exit 2 → main-red.
Fix: pass the JSON via an `env:` block (env values bypass shell quoting entirely)
and pipe it to the script using `printf '%s' "$COMMITS_JSON"`.
Closes#526.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
core-devops