chore: run build workflow on release branches too

Run build workflow on release branches (vX.Y) as well.

Author: ereslibre

.github/workflows/build.yml

@@ -2,9 +2,9 @@ name: Rust
 
 on:
   push:
-    branches: [ "main" ]
+    branches: [ "main", "v[0-9]+.[0-9]+" ]
   pull_request:
-    branches: [ "main" ]
+    branches: [ "main", "v[0-9]+.[0-9]+" ]
 
 env:
   CARGO_TERM_COLOR: always