Fix codespace boot failure by using updateContentCommand instead of postCreateCommand

Co-authored-by: rajbos <6085745+rajbos@users.noreply.github.com>

Author: Copilot

.devcontainer/devcontainer.json

@@ -23,6 +23,6 @@
       }
     }
   },
-  "postCreateCommand": "npm ci",
+  "updateContentCommand": "npm ci",
   "remoteUser": "node"
 }