Fixed codespaces not cloning submodule automatically

Author: Arlodotexe

.devcontainer/devcontainer.json

@@ -55,7 +55,7 @@
 	//      "mounts": [ "source=${env:HOME}${env:USERPROFILE}/.aspnet/https,target=/home/vscode/.aspnet/https,type=bind" ],
 	// Use 'postCreateCommand' to run commands after the container is created.
 	// "postCreateCommand": "dotnet restore",
-	"postCreateCommand": "dotnet dev-certs https --trust",
+	"postCreateCommand": "git submodule update --init; dotnet dev-certs https --trust",
 	// Comment out connect as root instead. More info: https://aka.ms/vscode-remote/containers/non-root.
 	"remoteUser": "vscode",
 	"features": {