Update docker/build-push-action action to v7

| datasource  | package                  | from | to |
| ----------- | ------------------------ | ---- | -- |
| github-tags | docker/build-push-action | v6   | v7 |


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

Author: renovate[bot]

.github/workflows/build-and-push-containers.yml

@@ -35,7 +35,7 @@ jobs:
           password: ${{ secrets.CONTAINER_PAT }}
 
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           file: ./Dockerfile

.github/workflows/continuous-integration.yml

@@ -43,7 +43,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build container for CI pipeline
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           load: true
@@ -125,7 +125,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           push: false