How much does it really cost to buy more powerful cloud compute resources for development work? A lot less than you think.
You can even upload binaries in a single step:
curl -H "Authorization: token <yours>" -H "Accept: application/vnd.github.manifold-preview" -H "Content-Type: application/zip" --data-binary @build/mac/package.zip "https://uploads.github.com/repos/hubot/singularity/releases/123/assets?name=1.0.0-mac.zip"
Check out the full API docs for details, and go build something!