refactor: remove need for internal dokku calls

Avoid internal dokku calls will avoid potentially expensive subprocesses - in particular, user-auth will be re-invoked, which can be expensive.

plugins/storage/internal-functions

@@ -81,9 +81,9 @@ cmd-storage-list() {
   declare cmd="storage:list"
   [[ "$1" == "$cmd" ]] && shift 1
   declare APP="$1"
-  local passed_phases="deploy"
+  local phase="deploy"
 
   verify_app_name "$APP"
   dokku_log_quiet "$APP volume bind-mounts:"
-  get_bind_mounts "$(get_phase_file_path "$passed_phases")"
+  plugn trigger storage-list "$APP" "$phase"
 }

plugins/storage/storage-list

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_AVAILABLE_PATH/docker-options/functions"
+source "$PLUGIN_AVAILABLE_PATH/storage/functions"
+
+trigger-storage-storage-list() {
+  declare desc="storage storage-list trigger"
+  declare trigger="storage-list"
+  declare APP="$1" PHASE="$2"
+
+  get_bind_mounts "$(fn-get-phase-file-path "$APP" "$PHASE")"
+}
+
+trigger-storage-storage-list "$@"