Use pigz for increased backup and restore performance on multicore machines if available

username-removed-25949 requested to merge haynes/gitlab-ce:pigz into master

What does this MR do?

This MR enables the usage of pigz for creating and restoring backups if it is available on the machine. On my PC this allowed ~70% faster packaging compared to gzip.

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

everything. It's a small change, but non working backup and restore would be bad.

Why was this MR needed?

Currently the backup and restore task uses gzip which only runs on a single core, so it's pretty slow. pigz is "A parallel implementation of gzip for modern multi-processor, multi-core machines" Information on pigz:

What are the relevant issue numbers?

closes #20773 (closed)

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

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