Add github-cli and docker-outside-of-docker to devcontainer

.devcontainer/devcontainer.json

@@ -7,6 +7,10 @@
   "forwardPorts": [
     8080
   ],
+  "features": {
+    "ghcr.io/devcontainers/features/github-cli:1": {},
+    "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {}
+  },
   "customizations": {
     "vscode": {
       "settings": {