add s390x support

[lysliu]

Fix: #801

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.23%. Comparing base (29c8a21) to head (de0747e).

❗ Current head de0747e differs from pull request most recent head d9180c5. Consider uploading reports for the commit d9180c5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #802   +/-   ##
=======================================
  Coverage   72.23%   72.23%           
=======================================
  Files          20       20           
  Lines        2219     2219           
=======================================
  Hits         1603     1603           
  Misses        435      435           
  Partials      181      181           

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[Repana-Chowdappa]

@lysliu @caarlos0 Can we specify the arch value as "s390x" instead of s390? so that binary will come as nfpm_2.35.3_Linux_s390x.tar.gz

[caarlos0]

done in 507ad79