Bump docker/build-push-action from 6.7.0 to 6.8.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.7.0 to 6.8.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.7.0...v6.8.0)

---
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/publish-operator-docker-image.yml

@@ -42,7 +42,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: build and publish container
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.8.0
         with:
           push: true
           file: Dockerfile