Devcontainer: use "batman" user instead of root (#29704)

* devcontainer user

* cleanup permissions

* remove that

* remove that since it's not used

* clean that up after merge

* build base image first

* remove the pull

* build base image

* ensure we can pip install

* build base image as batman user

* add user uid

* add temporary comment about chown instruction

.devcontainer/Dockerfile

@@ -1,8 +1,5 @@
 FROM ghcr.io/commaai/openpilot-base:latest
 
-# remove gitconfig if exists, since its gonna be replaced by host one
-RUN rm -f /root/.gitconfig
-
 RUN apt update && apt install -y vim net-tools usbutils htop ripgrep tmux
 RUN pip install ipython jupyter jupyterlab
 

.devcontainer/container_post_create.sh

@@ -12,3 +12,9 @@ if [ -n "\$DISPLAY" ]; then
 fi
 EOF
 fi
+
+# These lines are temporary, to remain backwards compatible with old devcontainers
+# that were running as root and therefore had their caches written as root
+USER=batman
+sudo chown -R $USER: /tmp/scons_cache
+sudo chown -R $USER: /tmp/comma_download_cache

.devcontainer/devcontainer.json

@@ -14,13 +14,23 @@
   },
   "runArgs": [
     "--volume=/tmp/.X11-unix:/tmp/.X11-unix",
-    "--volume=${localWorkspaceFolder}/.devcontainer/.host/.Xauthority:/root/.Xauthority",
-    "--volume=${localEnv:HOME}/.comma:/root/.comma",
+    "--volume=${localWorkspaceFolder}/.devcontainer/.host/.Xauthority:/home/batman/.Xauthority",
+    "--volume=${localEnv:HOME}/.comma:/home/batman/.comma",
     "--volume=/tmp/comma_download_cache:/tmp/comma_download_cache",
     "--volume=/tmp/devcontainer_scons_cache:/tmp/scons_cache",
     "--shm-size=1G",
     "--add-host=host.docker.internal:host-gateway" // required to use host.docker.internal on linux
   ],
+  "features": {
+    "ghcr.io/devcontainers/features/common-utils:2": {
+      "installZsh": false,
+      "installOhMyZsh": false,
+      "upgradePackages": false,
+      "username": "batman"
+    }
+  },
+  "containerUser": "root",
+  "remoteUser": "batman",
   "customizations": {
     "vscode": {
       "extensions": [