fix: consolidate release pipeline into bump workflow

- Update release.sh to also bump docker-compose.yml image tag in the
  same commit, keeping the tagged commit in sync
- Add CI and Docker release jobs to bump.yml so it's self-contained
  (GITHUB_TOKEN pushes don't trigger other workflows)
- Remove "Pin docker-compose" post-step from release.yml since it's
  now handled by release.sh

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -54,15 +54,3 @@ jobs:
         uses: softprops/action-gh-release@v2
         with:
           generate_release_notes: true
-
-      - name: Pin docker-compose image to released version
-        env:
-          VERSION: ${{ github.ref_name }}
-        run: |
-          VERSION="${VERSION#v}"
-          sed -i "s|image: ghcr.io/bretzel-app/crumbs:.*|image: ghcr.io/bretzel-app/crumbs:${VERSION}|" docker-compose.yml
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add docker-compose.yml
-          git commit -m "chore: pin docker-compose to v${VERSION} [skip ci]"
-          git push origin HEAD:main