Add dummy gating test defined in test.yml that uses external script

- Resolves: rhbz#1738372

Signed-off-by: Yan Vugenfirer <yvugenfi@redhat.com>

gating.yaml

@@ -3,4 +3,4 @@ product_versions:
     - rhel-8
 decision_context: osci_compose_gate
 rules:
-    - !PassingTestCaseRule { test_case_name: manual.sst_virtualization.virtio-win.sanity }
+    - !PassingTestCaseRule { test_case_name: osci.brew-build.tier0.functional }

tests/scripts/run_tests.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+echo "Testing gating, let's fail"
+exit 1

tests/tests.yml

@@ -0,0 +1,11 @@
+---
+- hosts: localhost
+  roles:
+  - role: standard-test-basic
+    tags:
+    - classic
+    tests:
+    - simple:
+        dir: scripts
+        run: ./run_tests.sh
+