WIP: Resolve "Speed up build by parallelizing download of cached www-gitlab-com repo"

Chad Woolleyrequested to merge
6533-speed-up-build-by-parallelizing-download-of-cached-www-gitlab-com-repo into master

This MR is being closed without merge. We have decided to re-open and re-schedule the docker-based approach.

For more context, see: !40665 (comment 287868133)

In !40665 (merged), we implemented object-store caching of the www-gitlab-com repo.

But, the time to download and unzip the file is still very long.

See if we can possibly parallelize the download and/or unzipping of the file, as described in this comment

Closes #6533 (closed)

Edited by Chad Woolley

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