Everything is on GitHub - it's just impossible to find it. Luckily, GitHub has topics.
Once you've made some amazing GitHub Actions, you'll want to re-use them and share them with your friends. To do that you'll want to organize your project a little differently, publish and release them.
Working with Unity makes development easy. You can quickly prototype a game and show it off. But what if there are multiple developers. Storing your source code on GitHub makes collaboration easy; but there are a lot of tradeoffs when working with larger assets and projects.
GitHub Actions are still in beta and are changing quickly. But if you are looking to get started the possibilities are endless.