Update docker/build-push-action action to v7

.gitea/workflows/build-terraform-shell.yml

@@ -36,7 +36,7 @@ jobs:
           password: ${{ secrets.REGISTRY_PASSWORD }}
 
       - name: Build and push shell image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7
         with:
           context: .
           file: ./tools/terraform-shell/Dockerfile