Add Alpine Linux (APK) support to vmupdate

[alimirjamali]

related: QubesOS/qubes-issues#7323

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.03%. Comparing base (65eb613) to head (d2d6bf2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #192   +/-   ##
=======================================
  Coverage   73.03%   73.03%           
=======================================
  Files          10       10           
  Lines        1157     1157           
=======================================
  Hits          845      845           
  Misses        312      312           

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[marmarek]

FYI there is a bit of refactor in #191 and there will be conflicts. I'll let you know when to rebase.