Use latest v11 npm and set git safe.directory on build (#2738)

* install latest npm 11 on container build

* Fix setting git safe.directory

* Make setting git config more robust

Author: DocMoebiuz

frontend/.devcontainer/devcontainer.json

@@ -7,7 +7,7 @@
   },
 
   // Use 'postCreateCommand' to run commands after the container is created.
-  "postCreateCommand": "npm install && sudo npx playwright install-deps && npx playwright install",
+  "postCreateCommand": "git config --global --replace-all safe.directory \"$(dirname \"$PWD\")\" && npm install -g npm@11 && npm install && sudo npx playwright install-deps && npx playwright install",
   "postStartCommand": "npm install && npm run dev",
   "customizations": {
     "vscode": {