ci: update runner settings to run macOS workflow only weekly and manually (#65)

* ci: update runner settings to run macOS workflow only manually or on release branches

* feat: run CI only on schedule and manually

Author: daniel-rdt

.github/workflows/test.yaml

@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         # Run windows only on scheduled runs on Sundays, otherwise ignore
-        os: ${{ github.event.schedule == '0 5 * * 0' && fromJson('["ubuntu", "macos", "windows"]') || fromJson('["ubuntu", "macos"]') }}
+        os: ${{ github.event.schedule == '0 5 * * 0' && fromJson('["ubuntu", "macos", "windows"]') || fromJson('["ubuntu"]') }}
 
     defaults:
       run: