ci: run checks for commits on branch dev

.github/workflows/rust.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
     branches: ["*"]
   push:
-    branches: ["main"]
+    branches: ["main", "dev"]
 
 concurrency:
   # Documentation suggests ${{ github.head_ref }}, but that's only available on pull_request/pull_request_target triggers, so using ${{ github.ref }}.