0X0xbadcafebee·Sep 22, 2025
A custom language in GHA would be worse. You'd be limited by whatever language they supported, and any problems with it would have to go through their support team. It adds more burden on GHA (they spending more time/money on support) without creating value (new features you want).
You already don't have to use YAML. Use whatever language you want to define the configuration, and then dump it as YAML. By using your own language and outputting YAML, you get to implement any solution you want, and GitHub gets to spend more cycles building features.
Simple example:
1. Create a couple inherited Python classes
2. Write class functions to enable/disable GHA features and validate them
3. Have the functions store data in the class object
4. Use a library to output the class as YAML
5. Now craft your GHA config by simply calling a Python
Read the rest
object
6. Run code, save output file, apply to your repo
I don't know why nobody has made this yet, but it wouldn't be hard. Read GHA docs, write Python classes to match, output as YAML.
If you want more than GHA features support [via configuration], use the GHA API (https://docs.github.com/en/rest/actions) or scripted workflows feature (https://github.com/actions/github-script).