chore: add formatter settings

Author: Z9RTM

.devcontainer/devcontainer.json

@@ -6,6 +6,17 @@
 	"image": "mcr.microsoft.com/devcontainers/rust:1-1-bullseye",
 	"features": {
 		"ghcr.io/devcontainers/features/node:1": {}
+	},
+	// Configure tool-specific properties.
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"editor.formatOnSave": true,
+				"[rust]": {
+					"editor.defaultFormatter": "rust-lang.rust-analyzer"
+				}
+			}
+		}
 	}
 
 	// Use 'mounts' to make the cargo cache persistent in a Docker Volume.
@@ -26,9 +37,6 @@
 	// Use 'postCreateCommand' to run commands after the container is created.
 	// "postCreateCommand": "rustc --version",
 
-	// Configure tool-specific properties.
-	// "customizations": {},
-
 	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
 	// "remoteUser": "root"
 }