feat: compression option with xz support for deb

[erikgeiser]

This PR adds a compression option for deb files. Currently the following values are supported:

• gzip (default)
• xz (future default)
• none (no compression)

I think the best way to move forward is to keep gzip as default for now and wait for feedback from the users that use xz. If everything works great (and if xz build times are acceptable), we should make xz the default in a following release.

Closes #361.

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[codecov]

Codecov Report

Merging #363 (2c18ac9) into master (995311c) will increase coverage by 0.13%.
The diff coverage is 65.21%.

❗ Current head 2c18ac9 differs from pull request most recent head 0d2d305. Consider uploading reports for the commit 0d2d305 to get more accurate results

@@            Coverage Diff             @@
##           master     #363      +/-   ##
==========================================
+ Coverage   64.89%   65.03%   +0.13%     
==========================================
  Files          14       14              
  Lines        1262     1284      +22     
==========================================
+ Hits          819      835      +16     
- Misses        309      313       +4     
- Partials      134      136       +2     

Impacted Files	Coverage Δ
nfpm.go	86.20% <ø> (ø)
deb/deb.go	66.56% <65.21%> (+0.45%)	⬆️

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[caarlos0]

minor nitpick, lgtm otherwise

great work, thanks!

[erikgeiser]

I've prepared another PR that changes the default compression algorithm and the corresponding documentation. I will publish it as soon as this PR is merged, so you can easily update the default in another release if everything goes well.

[github-actions]

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