Change release trigger

.github/workflows/docker.yml

@@ -4,7 +4,7 @@ name: Create and publish a Docker image
 on:
   # See https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#webhook-payload-object-38
   release:
-    types: [ published ]
+    types: [ released, prereleased ]
   push:
     branches:
       - master