Update docker/build-push-action action to v6.12.0 (#953)

| datasource  | package                  | from    | to      |
| ----------- | ------------------------ | ------- | ------- |
| github-tags | docker/build-push-action | v6.11.0 | v6.12.0 |

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -191,7 +191,7 @@ jobs:
         continue-on-error: true
 
       - name: Build and Push Docker Image
-        uses: docker/build-push-action@b32b51a8eda65d6793cd0494a773d4f6bcef32dc # v6.11.0
+        uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d # v6.12.0
         with:
           file: build/Dockerfile
           context: "."