add devcontainer configs

.devcontainer/devcontainer.json

@@ -0,0 +1,23 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/typescript-node
+{
+	"name": "StableStudio dev",
+	"image": "mcr.microsoft.com/devcontainers/typescript-node:0-18",
+	"forwardPorts": [3000],
+	// avoid git "dubious ownership" errors, which break yarn 
+	"postStartCommand": "git config --global --add safe.directory ${containerWorkspaceFolder}",	
+	"postAttachCommand": "yarn",
+	"customizations": {
+		"vscode": {
+			"settings": {},
+			"extensions": [
+				"vscode.typescript-language-features"
+			]
+		}
+	},
+	"features": {
+		"ghcr.io/devcontainers/features/github-cli:1": {
+			
+		}
+	}
+}