separate workflow to more step so that it is easier to inspect

Author: dclong

.github/workflows/build_images.yml

@@ -33,10 +33,15 @@ jobs:
       - name: Store Docker Images on /mnt/docker
         run: |
           sudo ./config_docker.py
-      - name: Build Docker Images
+      - name: Show Docker Images
         run: |
           docker images
+      - name: Build Docker Images
+        run: |
           ./build_images.py --branch '${{ github.event.inputs.branch }}' --repo '${{ github.event.inputs.repo }}' --root-image-name '${{ github.event.inputs.root_image_name }}'
+      - name: Show Building Graph
+        run: |
           cat graph.yaml
+      - name: Show Docker Images
+        run: |
           docker images
-