Implement KEDA github actions scaler (Spike)

[emirgens]

To enable the use by external services (applications). Extend Keda with this scaler.

https://keda.sh/docs/2.18/scalers/github-runner/

1. First verify that it is possible to run the runners in Radix

DoD
User can scale based on GitHub actions queue

Important - we only "open the service"

(For the record - Nils is skeptisk)