gotestfmt 1.1.0: support for other CI systems

Originally, gotestfmt was built to support GitHub Actions only. However, being prompted by the community, we decided to expand its usefulness to other CI systems.

This change comes with batteries included. The instructions on how to get it running on some of the more popular CI systems are available in the readme.

If you have a CI system we didn’t cover so far, you can also contribute it to the template directory easily on GitHub.