Check goreleaser config in CI github workflow

[kwk]

This adds a check to the CI workflow file to check for the sanity of the .goreleaser.yml file by running goreleaser check.

[ejoffe]

@kwk - looks like the latest go releaser updates broke the brew install.

Error: invalid attribute for formula 'ejoffe/tap/spr': url ("https://github.com/ejoffe/spr/releases/download/v0.13.1/spr_darwin_x86_64 .tar.gz")
Please report this issue:
  https://docs.brew.sh/Troubleshooting
/usr/local/Homebrew/Library/Homebrew/formula.rb:293:in `validate_attributes!'
/usr/local/Homebrew/Library/Homebrew/formula.rb:223:in `initialize'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:483:in `new'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:483:in `get_formula'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:643:in `get_formula'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:762:in `factory'
/usr/local/Homebrew/Library/Homebrew/cli/parser.rb:647:in `block in formulae'
/usr/local/Homebrew/Library/Homebrew/cli/parser.rb:643:in `map'
/usr/local/Homebrew/Library/Homebrew/cli/parser.rb:643:in `formulae'
/usr/local/Homebrew/Library/Homebrew/cli/parser.rb:316:in `parse'
/usr/local/Homebrew/Library/Homebrew/cmd/upgrade.rb:127:in `upgrade'
/usr/local/Homebrew/Library/Homebrew/brew.rb:94:in `<main>'

[ejoffe]

Looks like goreleaser is messing up the urls inside the brew tap and adding a space, I'm not sure why... I fixed the space issue in the tap manually, but still need to figure out what is it in the new naming method in go releaser that is adding these spaces.

[kwk]

@ejoffe sorry for not noticing this earlier. I have created a fix here #345.