Add Railiance overlay repo scaffold

bin/railiance

@@ -16,6 +16,7 @@ Commands:
   gen-ssh-key   Generate SSH key and show public part
   cloudinit     Emit minimal cloud-init user-data
   init-repo     Idempotently furnish repo housekeeping
+  create-overlay Scaffold a Railiance overlay repo for an upstream app
   build-spore   Build a distributable "Spore" bundle
   seed-local    Run the seed script on this machine
   checklist     Pre-VM checklist
@@ -39,6 +40,7 @@ case "$cmd" in
     ;;
   cloudinit) cat "$ROOT/cloudinit/user-data.yaml" ;;
   init-repo) bash "$ROOT/tools/furnish_railiance_repo.sh" ;;
+  create-overlay) bash "$ROOT/tools/create_railiance_overlay_repo.sh" "$@" ;;
   build-spore) bash "$ROOT/tools/build_spore.sh" ;;
   seed-local) bash "$ROOT/tools/seed_node.sh" ;;
   checklist)