ci: only run when something is pushed to main branch

This prevent ci.yml workflow to be triggered when a tag is pushed

Author: devmatteini

.github/workflows/ci.yml

@@ -1,6 +1,10 @@
 name: CI
 
-on: [ push, pull_request ]
+on:
+  push:
+    branches:
+      - main
+  pull_request:
 
 env:
   CARGO_TERM_COLOR: always