add s390x support

[lysliu]

Fix: #801

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

:exclamation: 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

```diff @@ 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 507ad79260d3c3c851c7f0340d3782240846de91