[Packaging] Should we maintain the Arch linux repository?

[asfimport]

One thing that came up in ARROW-13192 is that Arrow on the the archlinux repo is out of date.

Arch linux isn't listed as a supported / maintained distribution, and as far as I can see we don't have any CI infrastructure that tests against it.

Reporter: Jonathan Keane / @jonkeane

_{Note: This issue was originally created as ARROW-13308. Please see the migration documentation for further details.}

[github-actions]

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