Merge pull request #3532 from dokku/3531-is-deployed

refactor: allow the scheduler to decide if an app is deployed

docs/development/plugin-triggers.md

@@ -1320,6 +1320,24 @@ DOKKU_SCHEDULER="$1"; APP="$2";
 # TODO
 ```
 
+### `scheduler-is-deployed`
+
+> Warning: The scheduler plugin trigger apis are under development and may change
+> between minor releases until the 1.0 release.
+
+- Description: Allows you to check if an app has been deployed
+- Invoked by: `dokku ps:rebuild`
+- Arguments: `$DOKKU_SCHEDULER $APP`
+- Example:
+
+```shell
+#!/usr/bin/env bash
+
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+DOKKU_SCHEDULER="$1"; APP="$2";
+
+# TODO
+```
 ### `scheduler-logs`
 
 > Warning: The scheduler plugin trigger apis are under development and may change