Experiment with generation of control variables

[erthalion]

Description

PoC for generating GHA components mass-producing control variables for further pipeline configuration. Dhall is used for generation, one needs to have dhall-to-yaml available.

Checklist

• [ ] Investigated and inspected CI test results
• [ ] Updated documentation accordingly

Automated testing

• [ ] Added unit tests
• [ ] Added integration tests
• [ ] Added regression tests

Testing Performed

Testing of the generation pipeline, without applying anywhere yet.