Support Autolinks with alphanumeric or numeric IDs

[douglascayers]

GitHub updated their autolink feature to support either alphanumeric or numeric IDs.

This is a request to update the github_repository_autolink_reference resource to support the new is_alphanumeric: boolean argument, which indicates whether this autolink reference matches alphanumeric characters. If false, this autolink reference is a legacy autolink that only matches numeric characters.

Example API Payload:

{
  "id": 1,
  "key_prefix": "TICKET-",
  "url_template": "https://example.com/TICKET?query=<num>",
  "is_alphanumeric": true
}

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I'm interested in working on adding this feature, and I've already submitted google/go-github#2450 to add this feature into go-github lib so that we can make use of it in this terraform plugin.

I'm a complete go novice, so I'm thankful 99% of the work for calling this API is already done 😅

Thanks!

[Djiit]

Hey team,

Interested in this too. Happy to pair/collaborate on it; but same, would need a bit of guidance to start.