title: Gitlab - cache error message about no URL
body: <p>I have the following logic in my GitLab-ci:</p>
  <pre><code>stages:
    - build
    - deploy
  
  
  job_make_zip:
    tags:
      - test123
    image: node:10.19
    stage: build
    script:
      - npm install
      - make
      - make source-package
    cache:
      key: ${CI_COMMIT_REF_SLUG}
      paths:
      - node_modules/
    artifacts:
      when:
      paths:
        - test.bz2
      expire_in: 2 days
  </code></pre>
  <p>When the job runs, I see the following message:</p>
  <pre><code>17 Restoring cache
  18 Checking cache for master...
  19 No URL provided, cache will not be downloaded from shared cache server. Instead a local version of cache will be extracted. 
  20 Successfully extracted cache    
  </code></pre>
  <p>I'm just new to Gitlab... and so I can't tell if this is an error or not.  I basically don't want to have to download the same npm modules every single time this build runs.
  I found a similar post here: <a href="https://stackoverflow.com/questions/55512534/gitlab-ci-caching-key">GitLab CI caching key</a>
  But I'm already using the correct gitlab CI variable.
  Any suggestions would be appreciated.</p>