Produce statically linked builds

[metachris]

📝 Summary

• Added make build-static and make build-portable-static (to not change default make build behaviour, and the static builds don't work on macOS)
• Creating statically linked binaries in Docker
• Creating statically linked binaries in goreleaser

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✅ I have run these commands

• make lint
• make test-race
• go mod tidy

[codecov-commenter]

Codecov Report

Merging #473 (9dfd203) into main (dbc02c6) will increase coverage by 0.23%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
+ Coverage   68.64%   68.88%   +0.23%     
==========================================
  Files           8        8              
  Lines        1263     1263              
==========================================
+ Hits          867      870       +3     
+ Misses        346      345       -1     
+ Partials       50       48       -2     

Flag	Coverage Δ
unittests	68.88% <ø> (+0.23%)	⬆️

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see 1 file with indirect coverage changes

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[jtraglia]

LGTM, though I needed to lookup what -tags osusergo,netgo did. This article explained things pretty well:

• https://www.dimoulis.net/posts/static-compilation-of-go-programs/

The makefile would benefit from de-duplication, but we can do that in another PR.

[jtraglia]

@metachris decided to push some changes. If you don't like them, feel free to revert. In these changes, I explicitly define a EXTRA_ENV variable instead of just setting CGO_FLAGS directly, that way it shows up in the console output.

[metachris]

i love it, that's amazing, thanks!

[jtraglia]

LGTM 🥇