Update docker/build-push-action action to v6.8.0

| datasource  | package                  | from   | to     |
| ----------- | ------------------------ | ------ | ------ |
| github-tags | docker/build-push-action | v6.7.0 | v6.8.0 |


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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -186,7 +186,7 @@ jobs:
         continue-on-error: true
 
       - name: Build and Push Docker Image
-        uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85 # v6.7.0
+        uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960 # v6.8.0
         with:
           file: build/Dockerfile
           context: "."