Default to non-root user

.devcontainer/devcontainer.json

@@ -8,5 +8,8 @@
 	"settings":{
 		"java.home": "/docker-java-home",
 		"terminal.integrated.shell.linux": "/bin/bash"
-	}
+	},
+	// Comment out the next line to run as root instead. Linux users, 
+	// update Dockerfile with your user's UID/GID if not 1000.
+	"runArgs": ["-u", "vscode"]
 }