Bump docker/build-push-action from 6.11.0 to 6.12.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.11.0 to 6.12.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@b32b51a...67a2d40)

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

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

.github/workflows/k8s-content-pr.yaml

@@ -84,7 +84,7 @@ jobs:
             org.opencontainers.image.vendor='Compliance Operator Authors'
       - name: Build container images and push
         id: docker_build
-        uses: docker/build-push-action@b32b51a8eda65d6793cd0494a773d4f6bcef32dc # v6
+        uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d # v6
         with:
           context: .
           file: ./Dockerfiles/ocp4_content