fix: improve change detection for GHAs (#27904)

.github/workflows/docker.yml

@@ -39,28 +39,39 @@ jobs:
 
     steps:
 
+      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Check for file changes
+        id: check
+        uses: ./.github/actions/change-detector/
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
       - name: Set up QEMU
+        if: steps.check.outputs.python || steps.check.outputs.frontend || steps.check.outputs.docker
         uses: docker/setup-qemu-action@v3
 
       - name: Set up Docker Buildx
+        if: steps.check.outputs.python || steps.check.outputs.frontend || steps.check.outputs.docker
         uses: docker/setup-buildx-action@v3
 
       - name: Try to login to DockerHub
+        if: steps.check.outputs.python || steps.check.outputs.frontend || steps.check.outputs.docker
         continue-on-error: true
         uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USER }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: "Checkout ${{ github.ref }} ( ${{ github.sha }} )"
-        uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-
       - name: Setup supersetbot
+        if: steps.check.outputs.python || steps.check.outputs.frontend || steps.check.outputs.docker
         uses: ./.github/actions/setup-supersetbot/
 
       - name: Build Docker Image
+        if: steps.check.outputs.python || steps.check.outputs.frontend || steps.check.outputs.docker
         shell: bash
         run: |
           # Single platform builds in pull_request context to speed things up