hw4: finalize selenoid and ansible workflow with citrus tests

ansible/playbooks/tests.yml

@@ -0,0 +1,11 @@
+---
+- name: Run tests on provisioned host
+  hosts: ggr_gateway
+  become: true
+  tags:
+    - tests
+  tasks:
+    - name: Execute test runner role when enabled
+      ansible.builtin.include_role:
+        name: test_runner
+      when: run_tests_via_ansible | bool