Merge pull request #190 from ZeitOnline/renovate/docker-build-push-action-7.x

MAINT: Update docker/build-push-action action to v7.0.0

Author: wosc

.github/workflows/release.yaml

@@ -31,7 +31,7 @@ jobs:
           project_name: ${{env.project}}
           environment: production
           gar_docker_auth: true
-      - uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8 # v6.19.2
+      - uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7.0.0
         with:
           context: .
           tags: ${{secrets.GAR_DOCKER_REGISTRY}}/${{env.project}}:${{github.sha}}