Add windows and mac runners

Author: rkoopmans

.github/workflows/ci-cd.yml

@@ -30,10 +30,11 @@ jobs:
         path: .coverage
 
   Test:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        os: ["ubuntu-latest", "windows-latest", "macos-latest"]
+    runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python ${{ matrix.python-version }}
@@ -51,7 +52,7 @@ jobs:
       if: success()
       uses: actions/upload-artifact@v4
       with:
-        name: coverage-${{ matrix.python-version }}
+        name: coverage-${{ matrix.python-version }}-${{ matrix.os }}
         path: .coverage
 
   combine-coverage: