Update docker/build-push-action action to v7 (#1049)

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

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

@@ -65,7 +65,7 @@ jobs:
         uses: docker/setup-buildx-action@v4
 
       - name: Build binary
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           pull: true
           push: false

.github/workflows/docker-openresty.yml

@@ -63,7 +63,7 @@ jobs:
           DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
 
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           file: Dockerfile-openresty
           pull: true

.github/workflows/docker.yml

@@ -80,7 +80,7 @@ jobs:
           DOCKER_METADATA_ANNOTATIONS_LEVELS: manifest,index
 
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           pull: true
           push: true

.github/workflows/system-testing.yml

@@ -44,7 +44,7 @@ jobs:
         uses: docker/setup-buildx-action@v4
 
       - name: Build nginx
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           pull: true
           load: true
@@ -56,7 +56,7 @@ jobs:
             NGINX_VERSION=${{ steps.vars.outputs.nginx_version }}
 
       - name: Build backend
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           pull: true
           load: true
@@ -67,7 +67,7 @@ jobs:
           cache-to: type=gha,scope=system-backend,mode=max
 
       - name: Build grpc-backend
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           pull: true
           load: true

.github/workflows/update-docker-images.yml

@@ -133,7 +133,7 @@ jobs:
         if: ${{ matrix.needs-updating == 'true' }}
 
       - name: Build and push
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           pull: true
           push: true