chore(deps): bump docker/build-push-action from 6 to 7

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/containerbuild.yml

@@ -57,7 +57,7 @@ jobs:
         DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: ./docker
         file: ./docker/Dockerfile.postgres.dev
@@ -97,7 +97,7 @@ jobs:
       uses: docker/setup-buildx-action@v3
 
     - name: Build Docker image
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: ./
         file: ./docker/Dockerfile.nginx.prod