feat: implement nfpm archlinux packages

[Elara6331]

This PR implements the Archlinux packages that were added in nfpm v2.20.0, as well as tests and documentation for them.

goreleaser/nfpm#133
goreleaser/nfpm#543
Fixes #3469

[codecov]

Codecov Report

Merging #3470 (8030f45) into main (0638b0a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 8030f45 differs from pull request most recent head 6555592. Consider uploading reports for the commit 6555592 to get more accurate results

@@            Coverage Diff             @@
##             main    #3470      +/-   ##
==========================================
+ Coverage   84.25%   84.26%   +0.01%     
==========================================
  Files         114      114              
  Lines        9321     9329       +8     
==========================================
+ Hits         7853     7861       +8     
  Misses       1191     1191              
  Partials      277      277              

Impacted Files	Coverage Δ
pkg/config/config.go	95.21% <ø> (ø)
internal/pipe/nfpm/nfpm.go	94.29% <100.00%> (+0.12%)	⬆️

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[Elara6331]

The test is failing because nfpm v2.21.0 with the new code hasn't been released yet, so this will have to wait for that.

[caarlos0]

@Arsen6331 I plan to release nfpm either tomorrow or early next week

[caarlos0]

@Arsen6331 I plan to release nfpm either tomorrow or early next week

released, and updated on goreleaser main as well 0638b0a

[caarlos0]

can we also add archlinux to .goreleaser.yml?

[Elara6331]

Sure, one second

[caarlos0]

awesome, thank you @Arsen6331 ! <3

[github-actions]

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