Update docker.yml

.github/workflows/docker.yml

@@ -1,11 +1,10 @@
 # From https://docs.github.com/en/actions/publishing-packages/publishing-docker-images
 name: Create and publish a Docker image
 
-# Configures this workflow to run every time a change is pushed to the branch called `release`.
+# Run on release
 on:
-  push:
-    branches: ['release']
-
+  release:
+
 # 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:
   REGISTRY: ghcr.io