Only run unit tests on linux for PRs

Signed-off-by: Sebastian Malton <sebastian@malton.name>

.github/workflows/test.yml

@@ -57,7 +57,7 @@ jobs:
 
       - run: npm run test:unit
         name: Run tests
-        if: ${{ matrix.type == 'unit' }}
+        if: ${{ runner.os == 'Linux' && matrix.type == 'unit' }}
 
       - name: Install integration test dependencies
         id: minikube