Compile/cache only on main branch

Author: rfc2822

.github/workflows/test-dev.yml

@@ -12,6 +12,7 @@ concurrency:
 jobs:
   compile:
     name: Compile and cache
+    if: ${{ github.ref == 'refs/heads/main' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4