Change action trigger to release

.github/workflows/build-docker-image.yml

@@ -3,8 +3,9 @@ name: Create and publish a Docker image
 
 # Configures this workflow to run every time a change is pushed to the branch called `release`.
 on:
-  push:
-    branches: ['release']
+  release:
+    types: [published]
+
 
 # Defines two custom environment variables for the workflow. These are used for the Container registry domain, and a name for the Docker image that this workflow builds.
 env: