set object policy/acl during upload

[till]

Our s3-compatible storage does not support bucket policies (like AWS or Minio do). So instead, we upload files and set a header to make the file public. For example, if I was to use mc (or any AWS SDK), I set an additional header of x-amz-acl: public-read with the request and it works.

I dug into the code briefly, it would probably need to go there:

goreleaser/internal/pipe/blob/upload.go

Lines 229 to 231 in df0216d

	opts := &blob.WriterOptions{
	ContentDisposition: "attachment; filename=" + path.Base(filepath),
	}

I would expose it via the config for blobs in .goreleaser.yml.

The questions are:

1. Would you be willing to support this in go releaser?
2. And then, any thoughts in general — e.g. config, or am I looking at the correct place?

I am happy to come up with a PR for this.

[caarlos0]

this is being discussed #3069