scripts: normalize project path to be relative to root for npm start

scripts/start.js

@@ -1 +1,15 @@
+const findIndex = require('lodash/findIndex')
+const path = require('path')
+
+// if passing the --project arg, normalize its value so that it's
+// relative to the root and not to packages/server
+const projectArgIndex = findIndex(process.argv, (arg) => arg === '--project')
+if (projectArgIndex > -1) {
+  const projectPath = process.argv[projectArgIndex + 1]
+  // make sure it's the path and not another argument flag
+  if (projectPath.substring(0, 2) !== '--') {
+    process.argv[projectArgIndex + 1] = path.resolve(projectPath)
+  }
+}
+
 require('@packages/server')