fix: add the PAXHeaders for file checksum required by alpine 3.13+

[djgilcrease]

closes #288

[vercel]

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[codecov]

Codecov Report

Merging #291 (463b039) into master (de0df62) will decrease coverage by 0.06%.
The diff coverage is 73.68%.

@@            Coverage Diff             @@
##           master     #291      +/-   ##
==========================================
- Coverage   70.17%   70.10%   -0.07%     
==========================================
  Files           9        9              
  Lines        1103     1104       +1     
==========================================
  Hits          774      774              
  Misses        204      204              
- Partials      125      126       +1     

Impacted Files	Coverage Δ
apk/apk.go	70.33% <73.68%> (-0.30%)	⬇️

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[caarlos0]

Amazing work @djgilcrease!

LGTM

[nxadm]

Sorry, this PR needs some work and should best be reverted:
From: 3b7e015#commitcomment-46779187
@djgilcrease, this fix does not work as intended. Yes, the packages are installed, but in my case it blows the size of the package from 15MB ot 81MB compressed:

With nfpm before PR:

-rw-r--r--    1 root     root       14.9M Feb  5 08:12 rakudo-pkg-Alpine3.11_2020.12-01_x86_64.apk
-rw-r--r--    1 root     root         101 Feb  5 08:12 rakudo-pkg-Alpine3.11_2020.12-01_x86_64.apk.sh
-rw-r--r--    1 root     root         174 Feb  5 08:12 rakudo-pkg-Alpine3.11_2020.12-01_x86_64.apk.sha512

With a build from this PR:

total 81M    
-rw-r--r--    1 root     root       81.3M Feb  5 07:06 rakudo-pkg-Alpine3.11_2020.12-01_x86_64.apk
-rw-r--r--    1 root     root         101 Feb  5 07:06 rakudo-pkg-Alpine3.11_2020.12-01_x86_64.apk.sh
-rw-r--r--    1 root     root         174 Feb  5 07:06 rakudo-pkg-Alpine3.11_2020.12-01_x86_64.apk.sha512

[github-actions]

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