refactor: extract release_and_deploy calls to a plugin trigger

Better would be to separate the release and deploy aspects into distinct triggers - as well as have it release a specific image - but this is a good first pass.

plugins/common/functions

@@ -634,7 +634,7 @@ dokku_receive() {
   dokku_log_info1 "Building $APP from $IMAGE_SOURCE_TYPE..."
   DOKKU_QUIET_OUTPUT=1 config_set --no-restart "$APP" DOKKU_APP_TYPE="$IMAGE_SOURCE_TYPE"
   dokku_build "$APP" "$IMAGE_SOURCE_TYPE" "$TMP_WORK_DIR"
-  release_and_deploy "$APP"
+  plugn trigger release-and-deploy "$APP"
 }
 
 docker_cleanup() {