Use non-root user by default, bundled lldb adapter

.devcontainer/devcontainer.json

@@ -7,12 +7,14 @@
 		"vadimcn.vscode-lldb"
 	],
 	"runArgs": [
-		"--cap-add=SYS_PTRACE",
-		"--security-opt",
-		"seccomp=unconfined"
+		// Comment out the next line to run as root instead. Linux users, 
+		// update Dockerfile with your user's UID/GID if not 1000.
+		"-u", "vscode",
+
+		"--cap-add=SYS_PTRACE", "--security-opt", "seccomp=unconfined"
 	],
 	"settings": {
-		"lldb.executable": "/usr/bin/lldb-3.9",
+		"lldb.adapterType": "bundled",
 		"terminal.integrated.shell.linux": "/bin/bash"
 	}
 }