Feat: Use carbonRunner for GitHub Action Execution

[julian-st]

Is your feature request related to a problem? Please describe.

This repos GitHub Actions (workflows) uses ubuntu-latest but using this tag runs all the jobs in Azure (high-grid intensity) regions ... cough cough (350gCO2/kWh). We can make this better, more carbon-aware.

Describe the solution you'd like

Swap the runs-on tag to CarbonRunner's carbon-aware runner. Finding the most low-carbon region and runs your jobs there. It saves 90% of emissions, 25% per minute cost (free for open-source projects) and is 40% faster than GitHub.

Rationale

What are the use-cases?
Use a smaller carbon footprint

Are you willing to implement this feature? Yes but not right now