Move all commands into subcommand structure

subcommands/promote

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/config"
+set -eo pipefail; [[ $DOKKU_TRACE ]] && set -x
+source "$PLUGIN_BASE_PATH/common/functions"
+source "$(dirname "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)")/functions"
+
+postgres-promote-cmd() {
+  [[ -z $2 ]] && dokku_log_fail "Please specify a name for the service"
+  [[ -z $3 ]] && dokku_log_fail "Please specify an app to run the command on"
+  verify_service_name "$2"
+  verify_app_name "$3"
+  promote "$2" "$3"
+}
+
+postgres-promote-cmd "$@"