Trigger wheels building only on tags or PRs to main

Author: FrancescAlted

.github/workflows/cibuildwheels.yml

@@ -3,8 +3,6 @@ on:
   # Trigger the workflow on push or pull request,
   # but only for the main branch
   push:
-    branches:
-      - main
     tags:
       - '*'
   pull_request:
@@ -25,8 +23,6 @@ env:
 jobs:
 
   build_wheels:
-    # Only build wheels when tagging (typically a release)
-    # if: startsWith(github.event.ref, 'refs/tags')
     name: Build wheels on ${{ matrix.os }} for ${{ matrix.arch }} - ${{ matrix.p_ver }}
     runs-on: ${{ matrix.os }}
     permissions: