fix: upload gcs blobs to bucket root

[abemedia]

Currently, when trying to upload files to the root of a gcs bucket using the config below it actually creates a directory called / with all the files inside it.

blobs:
  - provider: gs
    bucket: my-bucket-name
    ids:
      - myapp
    folder: '/'

This fix allows uploading to the root of a gcs bucket.

[vercel]

@abemedia is attempting to deploy a commit to the goreleaser Team on Vercel.

A member of the Team first needs to authorize it.

[codecov]

Codecov Report

Merging #2373 (09bcdc0) into master (5b3f286) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #2373   +/-   ##
=======================================
  Coverage   82.92%   82.93%           
=======================================
  Files          83       83           
  Lines        6062     6064    +2     
=======================================
+ Hits         5027     5029    +2     
  Misses        887      887           
  Partials      148      148           

Impacted Files	Coverage Δ
internal/pipe/blob/upload.go	73.80% <100.00%> (+0.31%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5b3f286...09bcdc0. Read the comment docs.

[caarlos0]

I think you could just not inform anything on folder? Its the same behavior on other places AFAIK 🤔

[abemedia]

If folder is an empty string it goes to {{.PackageName}}/{{.Version}}.

[caarlos0]

ah, makes sense... can you add a test for it as well?

thanks!

[abemedia]

Sure thing!

[github-actions]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.