Update webhook to trigger on release publish

Author: NeoScript

.github/workflows/deploy_on_release.yml

@@ -3,8 +3,8 @@
 name: Create and publish a Docker image
 
 on:
-  push:
-    branches: ['release']
+  release:
+    types: ['published']
 
 env:
   REGISTRY: ghcr.io