feat: add a Railpack builder to Dokku

Closes #7615

plugins/builder-railpack/post-app-clone-setup

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+source "$PLUGIN_CORE_AVAILABLE_PATH/common/property-functions"
+set -eo pipefail
+[[ $DOKKU_TRACE ]] && set -x
+
+trigger-builder-railpack-post-app-clone-setup() {
+  declare desc="sets up properties for new app"
+  declare trigger="post-app-clone-setup"
+  declare OLD_APP="$1" NEW_APP="$2"
+
+  fn-plugin-property-clone "builder-railpack" "$OLD_APP" "$NEW_APP"
+}
+
+trigger-builder-railpack-post-app-clone-setup "$@"