Add the file-cache test to the CI tests.

.gitlab-ci.yml

@@ -235,6 +235,12 @@ regression:tls:delete-secret:
     - cd ../test/e2e/deleteTLSsecret
     - make deploy verify undeploy
 
+example:file-cache:
+  extends: .integration-tests
+  script:
+    - cd ../examples/file-cache
+    - make deploy verify undeploy
+
 .integration-tests:
   needs: ["build:controller"]
   stage: e2e