chore: migrate Netlify to GHA

[mmaietta]

Netlify has been extremely spotty as of late, see my open issue https://answers.netlify.com/t/build-error-on-focal-image-warning-python-3-8-was-not-found-on-your-system/126381

Using the integration, they're in the process of rolling out a new python image, but it's been extremely unstable. Errors include:
mise ERROR python is not a mise bin.
"pipenv" couldn't exec process: No such file or directory
Warning: Python ^3.8 was not found on your system...

Migrating to a docker image that one can use locally to build and deploy is a much more easily controlled environment

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Latest commit: bd5b1b6

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