feat: make generated brew formulas brew audit compatible (#1908)

[lukasmalkmus]

This PR resolves the issues described in #1908. I want to split this into two commits:

1. Add the license field (optional). If no SPDX license identifier is set, the field won't be present in the generated Formula.
2. Get rid of the whitespaces in otherwise empty lines.

Figuring the first one out was easy but I kinda struggle with the whitespaces. Really never thought that was the hard part... but gotemplates 🤦

[vercel]

@lukasmalkmus is attempting to deploy a commit to the Goreleaser Team on Vercel.

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[codecov]

Codecov Report

Merging #1911 (aeb64c8) into master (761c56a) will decrease coverage by 0.03%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master    #1911      +/-   ##
==========================================
- Coverage   81.73%   81.70%   -0.04%     
==========================================
  Files          73       73              
  Lines        3866     3880      +14     
==========================================
+ Hits         3160     3170      +10     
- Misses        580      582       +2     
- Partials      126      128       +2     

Impacted Files	Coverage Δ
pkg/config/config.go	93.75% <ø> (ø)
internal/pipe/brew/brew.go	77.94% <73.33%> (-0.51%)	⬇️

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[caarlos0]

LGTM so far :)

[caarlos0]

Figuring the first one out was easy but I kinda struggle with the whitespaces. Really never thought that was the hard part... but gotemplates 🤦

yeah that's always the worst, maybe we can remove them after compiling the template though 🤔

[lukasmalkmus]

yeah that's always the worst, maybe we can remove them after compiling the template though

Yes, I added that. Might be the quickest way to resolve this instead of dealing with templating (even if that would be the proper way I guess).

[lukasmalkmus]

Ready for review.

[caarlos0]

Thanks!

[github-actions]

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