Allow to set an optional GitHub API token to circumvent rate limiting #90
Description
In #86 we added a better error message for GitHub API failures.
However, if the rate limit error is thrown the error message they get is not the most useful one for people. I'd be in favor of catching that one specifically and replying with something like this:
We are sorry but we failed fetching the requested template from GitHub because your IP address has been rate limited. Please try the following to resolve the issue:
- Change your WiFi or make sure you are not connected to a VPN that might cause the rate limiting
If the issue persists you can try one of the two options:
- Get a GitHub developer token following https://help.github.com/en/articles/creating-a-personal-access-token-for-the-command-line (no permissions needed) and add it as `TWILIO_SERVERLESS_GITHUB_TOKEN` to your environment variables
- Wait for a few minutes up to an hour and try again.
For this we'd have to make sure to pass TWILIO_SERVERLESS_GITHUB_TOKEN to the GitHub API if it's available.