chore: add monorepo tools (#9196)

.devcontainer/devcontainer.json

@@ -21,6 +21,5 @@
     }
   },
   "updateContentCommand": "bash ./.devcontainer/build.sh",
-  "postCreateCommand": "bash ./.devcontainer/setup-user.sh",
-  "postStartCommand": ["yarn dev", "yarn workspace @affine/server dev"]
+  "postCreateCommand": "bash ./.devcontainer/setup-user.sh"
 }