There is act, that allows you to run actions locally. Although not exactly the same as the real thing, it can save time.

https://github.com/nektos/act

In organization setting this is almost useless if you are (or forced to) use some pre-made actions and/or actions that are for your organization only (they cannot be downloaded) also useless if you are forced to use self hosted runner with image that you don't have access to. Not to mention env/secrets and networking...

This is a great tool, but I always cringe when something so important comes from a third party

act is brilliant - it really helps iterate on github or gitea actions locally.

There's dagger; CI as code. Test your pipeline locally, in your IDE.