Bump docker/build-push-action from 4.1.1 to 4.2.1

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/2eb1c1961a95fc15694676618e422e8ba1d63825...0a97817b6ade9f46837855d676c4cca3a2471fc9)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docker-publish.yml

@@ -55,7 +55,7 @@ jobs:
       # Build and push Docker image with Buildx (don't push on PR)
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}