The lint task is problematic, because:
- It doesn’t check modifications to
ci/lint_imagefile
- It calls a separate script that installs packages on every run (taking time)
- It uses
*_cache
instructions to cache some installed parts, but not all
Fix all issues by using ci/lint_imagefile
(https://cirrus-ci.org/guide/docker-builder-vm/#dockerfile-as-a-ci-environment)