Fix devContainer startup (home-assistant#127042)

Author: srescio

.devcontainer/devcontainer.json

@@ -2,7 +2,7 @@
   "name": "Home Assistant Dev",
   "context": "..",
   "dockerFile": "../Dockerfile.dev",
-  "postCreateCommand": "script/setup",
+  "postCreateCommand": "git config --global --add safe.directory ${containerWorkspaceFolder} && script/setup",
   "postStartCommand": "script/bootstrap",
   "containerEnv": {
     "PYTHONASYNCIODEBUG": "1"