add github auth headers if there are GITHUB_TOKEN/GH_TOKEN set

[zryfish]

• Added _github_auth_headers() to read GH_TOKEN or GITHUB_TOKEN and return an Authorization header.
• Applied the header to:
  - GitHub API call for latest release (client.get(...)).
  - Asset download request (client.stream(...)) to cover initial GitHub redirect.

[localden]

Thanks for the contribution, @zryfish - is the scenario here that you want to run the CLI inside GitHub Actions, or generically on your development box?

[zryfish]

Thanks for the contribution, @zryfish - is the scenario here that you want to run the CLI inside GitHub Actions, or generically on your development box?

I keep hitting the “rate limit exceeded” error on my laptop, even though I’m just on my home network. Still, this setup might come in handy when running in GitHub Actions or on a dev box.

GitHub API returned 403 for https://api.github.com/repos/github/spec-kit/releases/latest

[localden]

Makes sense. @zryfish - let's also expose this as an argument to the CLI, like --github-token

[duccadhv1]

Makes sense. @zryfish - let's also expose this as an argument to the CLI, like --github-token

any update for cli argument?

[zryfish]

Makes sense. @zryfish - let's also expose this as an argument to the CLI, like --github-token

any update for cli argument?

Yeah, I've added the cli argument --github-token. @localden Please take a look.