[GitHub] allow manual pushes to docker registry

Author: minchinweb

.github/workflows/deploy-image.yml

@@ -7,7 +7,8 @@ name: Create and publish a Docker image
 
 on:
   push:
-    branches: ['release']
+    branches: ['master']
+  workflow_dispatch:
 
 env:
   REGISTRY: ghcr.io