[pnpm] add FEATURE_ID var

Author: joshuanianji

src/mount-pnpm-store/install.sh

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 USERNAME=${USERNAME:-${_REMOTE_USER}}
+FEATURE_ID="mount-pnpm-store"
 LIFECYCLE_SCRIPTS_DIR="/usr/local/share/${FEATURE_ID}/scripts"
 
 set -e