CI e2e is a matrix testing both the varnish & klarlack images.

.gitlab-ci.yml

@@ -244,6 +244,8 @@ example:file-cache:
     - cd ../examples/file-cache
     - make deploy verify undeploy
 
+# FOO:bar in the matrix config is just fake, because gitlab-ci
+# requires at least two distinct variables.
 .integration-tests:
   needs: ["build:controller"]
   stage: e2e
@@ -256,6 +258,12 @@ example:file-cache:
     KIND: v0.7.0
     HELM: v3.1.0
     TEST: local
+  parallel:
+    matrix:
+      - VARNISH:
+        - varnish
+        - klarlack
+        FOO: bar
   before_script:
     - apk add -U wget
     - apk add -U curl