Update devcontainer config (#78)

.devcontainer/devcontainer.json

@@ -1,8 +1,8 @@
 {
   "name": "HA Addon: TeslaMate",
-  "image": "ghcr.io/home-assistant/devcontainer:addons",
+  "image": "ghcr.io/home-assistant/devcontainer:2-addons",
   "appPort": ["7123:8123", "7357:4357"],
-  "postStartCommand": "sudo sed -i 's/export SUPERVISOR_VERSION=.*/export SUPERVISOR_VERSION=2024.03.1.dev1803/' /etc/supervisor_scripts/common && bash devcontainer_bootstrap", // Workaround until https://github.com/home-assistant/supervisor/issues/5021 is fixed"
+  "postStartCommand": "bash devcontainer_bootstrap",
   "runArgs": ["-e", "GIT_EDITOR=code --wait", "--privileged"],
   "containerEnv": {
     "WORKSPACE_DIRECTORY": "${containerWorkspaceFolder}"
@@ -27,5 +27,8 @@
       }
     }
   },
-  "mounts": ["type=volume,target=/var/lib/docker"]
-}
+  "mounts": [
+    "type=volume,target=/var/lib/docker",
+    "type=volume,target=/mnt/supervisor"
+  ]
+}