Minor cleanup to npm registry mock

.registry/.gitignore

@@ -0,0 +1 @@
+*.tgz

.registry/server.js

@@ -5,6 +5,7 @@ const app = express()
 
 const { PORT=4444 } = process.env
 const [,,port=PORT] = process.argv
+process.cwd(__dirname)
 
 app.use('/-/:tarball', (req,res,next) => {
   const url = decodeURIComponent(req.url)

package.json

@@ -20,7 +20,7 @@
     "sqlite3": "5.0.0"
   },
   "scripts": {
-    "registry": "cd .registry && node server.js",
+    "registry": "node .registry/server.js",
     "bookshop": "cds watch bookshop",
     "fiori": "cds watch fiori",
     "media": "cds watch media",