Change the way cache:paths and cache:untracked work together
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Problem to solve
Currently, cache attribute of the job is processed in the same way as artifacts. All the files matching the cache:paths are taken with addition of git ls-files -o if cache:untracked is specified. However placing version-controlled files in the cache makes little to no sense and can easily lead to hardly discoverable bugs.
Further details
The behavior was taken from artifacts attribute where it was reasonable.
Proposal
Fix processing of cache attribute so that specifying both cache:paths and cache:untracked means "take files from git ls-files -o and filter them against cache:paths"
Documentation
Currently this point is not covered in documentation.
gitlab-ce10230929 gitlab-ce4107606