ci: always cache even for failed jobs

Author: CMCDragonkai

.gitlab-ci.yml

@@ -26,6 +26,8 @@ default:
 # Cached directories shared between jobs & pipelines per-branch per-runner
 cache:
   key: $CI_COMMIT_REF_SLUG
+  # Preserve cache even if job fails
+  when: 'always'
   paths:
     - ./tmp/npm/
     # Homebrew cache is only used by the macos runner