Update alpine versions

Axel von Bertoldirequested to merge
avonbertoldi/alpine-versions into main
  • Add support for alpine version 3.21.
  • Drop support for EOL alpine versions 3.16 and 3.17.
  • Make alpine version 3.21 the default/latest version .
  • Add docs indicating that starting with %18.0 we will only create runner packages for one alpine version (latest).

Best reviewed commit-at-a time.

Edited by Axel von Bertoldi

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