Simulator: fix port issues in devcontainer (#29977)

* fix sim devcontainer

* use host.docker.internal instead

* devcontainer supports jsonc
old-commit-hash: 1f8ceb4ca15b2aa71d88e74c7df54519ed5968e9

.devcontainer/Dockerfile

@@ -9,3 +9,5 @@ RUN pip install ipython jupyter jupyterlab
 RUN cd $HOME && \
     curl -O https://raw.githubusercontent.com/commaai/agnos-builder/master/userspace/home/.tmux.conf && \
     curl -O https://github.com/commaai/agnos-builder/blob/master/userspace/home/.vimrc
+
+ENV CARLA_HOST="host.docker.internal"

.devcontainer/devcontainer.json

@@ -18,7 +18,8 @@
     "--volume=${localEnv:HOME}/.comma:/root/.comma",
     "--volume=/tmp/comma_download_cache:/tmp/comma_download_cache",
     "--volume=/tmp/devcontainer_scons_cache:/tmp/scons_cache",
-    "--shm-size=1G"
+    "--shm-size=1G",
+    "--add-host=host.docker.internal:host-gateway" // required to use host.docker.internal on linux
   ],
   "customizations": {
     "vscode": {