Update and improve dev env, testing, building and publishing (#143)

.devcontainer/devcontainer.json

@@ -1,9 +1,12 @@
 {
   "name": "HA Addon: TeslaMate",
-  "image": "ghcr.io/home-assistant/devcontainer:2-addons",
+  "image": "ghcr.io/home-assistant/devcontainer:4-apps",
+  "overrideCommand": false,
   "appPort": ["7123:8123", "7357:4357"],
   "postStartCommand": "bash devcontainer_bootstrap",
   "runArgs": ["-e", "GIT_EDITOR=code --wait", "--privileged"],
+  "workspaceFolder": "/mnt/supervisor/addons/local/${localWorkspaceFolderBasename}",
+  "workspaceMount": "source=${localWorkspaceFolder},target=${containerWorkspaceFolder},type=bind,consistency=cached",
   "containerEnv": {
     "WORKSPACE_DIRECTORY": "${containerWorkspaceFolder}"
   },
@@ -29,6 +32,7 @@
   },
   "mounts": [
     "type=volume,target=/var/lib/docker",
+    "type=volume,target=/var/lib/containerd",
     "type=volume,target=/mnt/supervisor"
   ]
 }