Actions: Support CUE

[rawkode]

Feature Description

I'd love to be able to write my actions using CUE, rather than YAML.

I know that today I can do this provided I export my CUE to YAML before commit, but I'd like to see better support.

CUE currently has curated schemas for GitHub which would likely work, but I'd be happy to help maintain Gitea specific if that would help.

https://registry.cue.works/docs/cue.dev/x/githubactions

I appreciate that adding CUE support may be too opinionated when there's soon many configuration languages out there. So id like to hear your thoughts.

If adding CUE isn't an option, perhaps a more generic preprocessing configuration to support arbitrary languages could be supported; much like GitLab supports.

Screenshots

No response

[techknowlogick]

As someone who also prefers non-YAML for actions (I use dhall in some non-Gitea repos) this would be neat. I suspect that the job parser would need to be the location where this change is applied