Set VISUAL in devcontainer

For rails credentials:edit mostly...

.devcontainer/devcontainer.json

@@ -3,7 +3,11 @@
 {
 	"name": "Ruby",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/devcontainers/ruby:1-3.2-bookworm"
+	"image": "mcr.microsoft.com/devcontainers/ruby:1-3.2-bookworm",
+
+	"containerEnv": {
+		"VISUAL": "code --wait"
+	}
 
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	// "features": {},