Move post-deploy trigger to core-post-deploy. Refs #2367

This avoids issues where community plugins may break core commands because of issues in the command output.

plugins/ps/core-post-deploy

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/functions"
+source "$PLUGIN_AVAILABLE_PATH/config/functions"
+source "$PLUGIN_AVAILABLE_PATH/ps/functions"
+
+ps_core_post_deploy() {
+  declare desc="ps core-post-deploy plugin trigger"
+  local trigger="ps_core_post_deploy"
+  local APP="$1"
+
+  remove_procfile "$APP"
+  config_set --no-restart "$APP" DOKKU_APP_RESTORE=1
+}
+
+ps_core_post_deploy "$@"