Run API tests on ubuntu

Author: vbreuss

.github/workflows/ci.yml

@@ -33,12 +33,8 @@ jobs:
           name: Code coverage ${{ matrix.os }}
           path: "**/coverage.cobertura.xml"
   api-test:
-    name: Test
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ubuntu-latest, windows-latest, macos-latest]
-    runs-on: ${{ matrix.os }}
+    name: API Test
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout sources
         uses: actions/checkout@v4