feat(devcontainer): add gh and dind features

Useful for local GitHub Actions debugging with nektos/act

.devcontainer/devcontainer.json

@@ -11,6 +11,8 @@
 			]
 		}
 	},
-	// Features to add to the dev container. More info: https://containers.dev/features.
-	// "features": {}
-}
+	"features": {
+		"ghcr.io/devcontainers/features/docker-in-docker:2": {},
+		"ghcr.io/devcontainers/features/github-cli:1": {}
+	}
+}