[DEBUG] Test only main build

Author: PatKamin

Diff for: .github/workflows/nightly.yml

@@ -26,7 +26,7 @@ jobs:
         shared_library: ['ON', 'OFF']
         static_hwloc: ['ON', 'OFF']
         generator: ['Ninja', 'NMake Makefiles']
-        umfd_lib: ['ON', 'OFF']
+        umfd_lib: ['OFF']
 
     runs-on: windows-latest