feat: add artifacts and metadata outputs

[crazy-max]

follow-up #318 (comment)

[codecov]

Codecov Report

Merging #327 (93ec58d) into master (affd781) will decrease coverage by 8.47%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #327      +/-   ##
==========================================
- Coverage   79.24%   70.76%   -8.48%     
==========================================
  Files           4        4              
  Lines         106      130      +24     
  Branches       18       23       +5     
==========================================
+ Hits           84       92       +8     
- Misses         14       25      +11     
- Partials        8       13       +5     

Impacted Files	Coverage Δ
src/goreleaser.ts	59.70% <23.80%> (-16.39%)	⬇️
src/context.ts	88.88% <100.00%> (+5.55%)	⬆️

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