Bump docker/build-push-action from 4.0.0 to 6.8.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4.0.0 to 6.8.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@3b5e802...32945a3)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/docker-image.yml

@@ -61,7 +61,7 @@ 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@3b5e8027fcad23fda98b2e3ac259d8d67585f671
+        uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960
         with:
           context: .
           push: ${{ github.event_name != 'pull_request' }}