Github rate limit error handling

[Nortamo]

To fetch the latest tag name, we currently query the Github API. This can hit a rate limit and we don't currently check for this error state:

curl -s https://api.github.com/repos/conda-forge/miniforge/releases/latest
{"message":"API rate limit exceeded for 86.50.165.212. (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)","documentation_url":"https://docs.github.com/rest/overview/resources-in-the-rest-api#rate-limiting"

• Implement check for this
• Sensible error state or fallback

[Nortamo]

curl -w "%{url_effective}\n" -I -L -s -S https://github.com/conda-forge/miniforge/releases/latest -o /dev/null | rev | cut -d / -f1 | rev
Should not the trick and does not count as using the API