chore: use a distinct tag for the cron image build

.gitlab-ci.yml

@@ -34,15 +34,15 @@ update_build:
   before_script:
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN http://$CI_REGISTRY
   script:
-    - docker build --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA .
-    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA
+    - docker build --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA-update .
+    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA-update
   tags:
     - image-build
 
 update:
   stage: periodic
   image:
-    name: $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA
+    name: $CI_REGISTRY_IMAGE:$CI_COMMIT_SHORT_SHA-update
     entrypoint: [""]
 
   only: