enable build on CI for all 3 OSs

Author: arcuri82

.github/workflows/ci.yaml

@@ -19,7 +19,10 @@ on:
 
 jobs:
   full-build-base:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+        matrix:
+          os: [ ubuntu-latest, windows-latest, macos-latest ]
     steps:
       # Checkout code
       - uses: actions/checkout@v4