Set up lefthook for Ruby formatters and type checking

.devcontainer/devcontainer.json

@@ -4,29 +4,24 @@
 	"name": "Ruby",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
 	"image": "mcr.microsoft.com/devcontainers/ruby:1-3.4-bullseye",
-	"features": {
-		"ghcr.io/meaningful-ooo/devcontainer-features/fish:2": {},
-		"ghcr.io/nikobockerman/devcontainer-features/fish-persistent-data:2": {}
-	},
+	"features": {},
 	"customizations": {
 		"vscode": {
 			"extensions": [
 				"Shopify.ruby-extensions-pack",
-				"dbaeumer.vscode-eslint",
 				"aliariff.vscode-erb-beautify",
 				"KoichiSasada.vscode-rdbg",
 				"qwtel.sqlite-viewer",
-				"esbenp.prettier-vscode",
 				"ms-azuretools.vscode-docker"
 			]
 		}
-	}
+	},
 	// Features to add to the dev container. More info: https://containers.dev/features.
 	// "features": {},
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [],
 	// Use 'postCreateCommand' to run commands after the container is created.
-	// "postCreateCommand": "ruby --version",
+	"postCreateCommand": "sudo apt update && sudo apt install --no-install-recommends --no-install-suggests -qy watchman",
 	// Configure tool-specific properties.
 	// "customizations": {},
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.