The Docker-image builds ran independently of the Test workflow, so a
failing test would not block publishing the :develop image (or a
release). GitHub Actions `needs:` only works within one workflow, so the
two separate workflows didn't depend on each other.
Make test.yml a reusable workflow (workflow_call) and call it from
develop.yml and release.yml as a `test` job that `build` depends on
(`needs: test`); release's `release` job already needs `build`, so it
waits transitively. test.yml keeps its pull_request trigger for PR
gating; its redundant push:develop trigger is dropped (develop.yml now
calls it on push).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
