Only do RelDebug on Windows instead of Release+Debug

Author: Foereaper

.github/workflows/win-build.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        build-type: [Release, Debug]
+        build-type: [RelDebug]
 
     steps:
     - uses: actions/checkout@v4