add service hijacking to add to file not overwrite (#1067)

Signed-off-by: Paige Patton <prubenda@redhat.com>

Author: paigerube14

.github/workflows/tests.yml

@@ -95,7 +95,7 @@ jobs:
             echo "test_node" >> ./CI/tests/functional_tests
             echo "test_pod" >> ./CI/tests/functional_tests
             echo "test_pod_error" >> ./CI/tests/functional_tests
-            echo "test_service_hijacking" > ./CI/tests/functional_tests
+            echo "test_service_hijacking" >> ./CI/tests/functional_tests
             echo "test_pod_network_filter" >> ./CI/tests/functional_tests
             echo "test_pod_server" >> ./CI/tests/functional_tests
             echo "test_time" >> ./CI/tests/functional_tests