test for multi devcontainers

.devcontainer/devcontainer.json

@@ -35,7 +35,7 @@
 
 	// Use 'postCreateCommand' to run commands after the container is created.
 	//"postCreateCommand": "git lfs pull && npm ci",
-        "postCreateCommand": "echo test",
+        "postCreateCommand": "echo test > aaaa-test.txt",
 
 	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "node"