Looking at https://travis-ci.org/github/cloudflare/gokey, we see the following banner at the top of the page:

Since June 15th, 2021, the building on travis-ci.org is ceased. Please use travis-ci.com from now on.

Also, looks like the last time Travis CI ran on this repo was a year ago per the same page. Given the Travis CI change of support for open-source projects, it may make sense to either upgrade to a paid Travis CI offering or migrate to an alternative, such as GitHub Actions or any other service provider.

FWIW, I'm not affiliated with any of these, just thought I'd give you a heads up.