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Use parallel compression and decompression for gzip archives and caches

Ben Boeckel requested to merge ben.boeckel/gitlab-runner:parallel-gzip into master

What does this MR do?

Enables parallel compression and decompression of gzip archives and caches.

Why was this MR needed?

Archive and cache creation and extraction is a known bottleneck with gitlab-ci.

Are there points in the code the reviewer needs to double check?

Unlikely?

Does this MR meet the acceptance criteria?

  • Documentation created/updated
  • Added tests for this feature/bug
    • meant to be a drop-in replacement; existing tests should suffice
  • In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

#4906 (closed)

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