chore: Use goreleaser to publish releases

[tmccombs]

Fixes: #114

[yermulnik]

Switch in artifact naming was... unexpectedly crucial for our pipeline 😢
https://github.com/tmccombs/hcl2json/releases/tag/v0.6.5

https://github.com/tmccombs/hcl2json/releases/tag/v0.6.6

[tmccombs]

hmm, I can change the os and arch naming to be consistent with what it was before, but I'd like to keep the compressed packages.

[yermulnik]

We already updated our CI pipeline to adhere with the new naming format. Please leave it as is if there are no other folks asking for a change.
My comment was more of pointing out an unexpectedness of an unannounced change in artifact naming. Apologies that I wasn't clear enough.

[yermulnik]

@tmccombs Can you please at least announce changes to artifact names via release notes at least? 😢 https://github.com/tmccombs/hcl2json/releases/tag/v0.6.7

Also could you please let me know whether you've finished changing Goreleaser config to produce different artifacts every new release and we can rely upon a stable artifact naming template? Thanks.

Relates to #120