distro/tests: check kres-cache-gc is started

distro/tests/ansible-roles/knot_resolver/tasks/main.yaml

@@ -23,6 +23,8 @@
     - include: test_tls.yaml
     - include: test_dnssec.yaml
 
+    - include: test_kres_cache_gc.yaml
+
     - name: Test DoH
       block:
         - name: Install knot-resolver-module-http

distro/tests/ansible-roles/knot_resolver/tasks/test_kres_cache_gc.yaml

+---
+- name: check kres-cache-gc.service is active
+  shell: systemctl is-active -q kres-cache-gc.service