Update trigger event in demo workflow (#99)

This commit changes the trigger event in the demo workflow from a new
release to the completion of the "Publish Docker" workflow. This
adjustment ensures that the demo workflow only runs when the Docker
image has been successfully built, increasing the efficiency and
reliability of overall GitHub Actions.

.github/workflows/demo.yml

@@ -13,8 +13,10 @@
 name: Demo
 
 on:
-  release:
-    types: [ created ]
+  workflow_run:
+    workflows: [ "Publish Docker" ]
+    types:
+      - completed
 
 env:
   CSV_FILES: './tests/fixtures/batch/*.csv'
@@ -28,15 +30,6 @@ jobs:
     name: All Report Types
     runs-on: ubuntu-latest
     steps:
-      # Sleep for 15 minutes to wait for the Docker image to be built and pushed to the Docker Hub.
-      # This is a workaround for the Docker image not being available immediately after the release is created.
-      # I don't want to use a GA trigger to wait for the Docker image to be built and pushed to the Docker Hub,
-      # because in this case the name of the pipeline in the log will be "Demo", not the name of the tag.
-      # Usually it takes less than 12 minutes to build and push the Docker image.
-      # So 15 min - just in case.
-      - name: Wait for Docker image
-        run: sleep 900
-
       - name: Checkout code
         uses: actions/checkout@v4