only run cmake-dataflow ci on Linux

.github/workflows/ci.yml

@@ -132,6 +132,7 @@ jobs:
         timeout-minutes: 15
         run: cargo run --example cxx-dataflow
       - name: "Cmake example"
+        if: runner.os == 'Linux'
         timeout-minutes: 30
         run: cargo run --example cmake-dataflow