test dotenv effect over cache key

.gitlab-ci.yml

@@ -15,6 +15,7 @@ variables:
     - echo "VAR2=$GLOBAL2" >> ./job.env
     - echo "VAR3=$LOCAL1" >> ./job.env
     - echo "VAR4=$LOCAL2" >> ./job.env
+    - echi "CACHE=zimbra" >> ./job.env
     - cp -f ./job.env ./job.txt
     - cp -f ./job.env ./job.log
   artifacts:
@@ -28,10 +29,17 @@ variables:
 .test:
   image: quay.io/os-forge/rpm-ostree-engine:0.2.0
   stage: test
+  cache:
+    key: $CACHE
+    when: always
+    path:
+      - ./cache
   before_script:
     - env
   script:
     - env
+    - mkdir -p ./cache
+    - touch ./cache/id
   after_script:
     - env