Add scoped token generation to github_app_token data source

[elliotwms]

Resolves #3102

---

Before the change?

• It was not possible to provide a repositories argument to the github_app_token data source

After the change?

• It is now possible to provide a repositories argument to the github_app_token data source

Proof of work

Tested using examples/github_app_token:

• Created an output to get the token
• Used the token to fetch a scoped repo ✅
• Used the token to fetch a non-scoped repo ❌

➜  app_token git:(token-repositories) ✗ terraform plan
╷
│ Warning: Provider development overrides are in effect
│
│ The following provider development overrides are set in the CLI configuration:
│  - integrations/github in /Users/elliot/go/bin
│
│ The behavior may therefore not match any released version of the provider and applying changes may cause the state to become incompatible with published releases.
╵
data.github_app_token.this: Reading...
data.github_app_token.scoped[0]: Reading...
data.github_app_token.this: Read complete after 0s [id=id]
data.github_app_token.scoped[0]: Read complete after 0s [id=id]

Changes to Outputs:
  + token = "***"

You can apply this plan to save these new output values to the Terraform state, without changing any real infrastructure.

──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now.
➜  app_token git:(token-repositories) ✗ curl -s -H "Authorization: token ***" https://api.github.com/repos/elliotwms/emojistats -w "%{http_code}"
{
  ...
}
200%                                                                                                                                                                                                                                                                                                               ➜  app_token git:(token-repositories) ✗

➜  app_token git:(token-repositories) ✗ curl -s -H "Authorization: token ***" https://api.github.com/repos/elliotwms/infra -w "%{http_code}"
{
  "message": "Not Found",
  "documentation_url": "https://docs.github.com/rest/repos/repos#get-a-repository",
  "status": "404"
}
404%

Pull request checklist

• Schema migrations have been created if needed (example)
• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

---

[github-actions]

👋 Hi! Thank you for this contribution! Just to let you know, our GitHub SDK team does a round of issue and PR reviews twice a week, every Monday and Friday! We have a process in place for prioritizing and responding to your input. Because you are a part of this community please feel free to comment, add to, or pick up any issues/PRs that are labeled with Status: Up for grabs. You & others like you are the reason all of this works! So thank you & happy coding! 🚀

[stevehipwell]

Thanks for the PR @elliotwms, I've added a couple of review comments.

[stevehipwell]

Please make sure all your files have valid line endings.

[stevehipwell]

Suggested change

	var repositories []string
	if v, ok := d.GetOk("repositories"); ok {
	for _, repo := range v.([]any) {
	repositories = append(repositories, repo.(string))
	}
	}
	var repos []string
	if v, ok := d.GetOk("repositories"); ok {
	if a, ok := v.([]any); ok {
	repos := make([]string, len(a))
	for i, r := range a {
	if repo, ok := r.(string); ok {
	repos[i] = repo
	}
	}
	}
	}

This would be a safer pattern.