Reduce GitHub Actions emission by 90%

[drydenwilliams]

Problem:
The current GitHub Actions use ubuntu-latest which runs our jobs in fossil fuel Azure regions... cough cough (350gCO2/kWh)

Solution
Swap the runs-on tag to CarbonRunner's carbon-aware runner saving 90% of emissions and 25% per minute cost.

If we swapped the runs-on line in our workflows file it will find the lowest-CO2 region to run our jobs - automatically.

jobs:
  deploy: 
-   runs-on: ubuntu-latest
+   runs-on: carbonrunner-2vcpu-ubuntu-latest

[HarelM]

I'll need a lot more confidence that this won't break to trust the CI in this repo with these runners.
While I completely agree with the environment aspect of this, I don't trust third party runners from being secured, up all the time, and be kept free. Sorry...

[pnorman]

Is there any documentation from github on this issue?