[BUG]: autolink allows numbers during plan, but fails during apply

[MarkVaughn]

Expected Behavior

Plan should have failed with bad key_prefix, but passed

Actual Behavior

Plan echoed successful diff

+ resource "github_repository_autolink_reference" "all" {
+       etag                = (known after apply)
+       id                  = (known after apply)
+       is_alphanumeric     = false
+       key_prefix          = "PTFY25"
+       repository          = "apiv2"
+       target_url_template = "https://***.atlassian.net/browse/PTFY25-<num>"

But during apply

Error: POST https://api.github.com/repos/****/apiv2/autolinks: 422 Validation Failed [{Resource:KeyLink Field:key_prefix Code:custom Message:key_prefix must not end with a number} {Resource:KeyLink Field:key_prefix Code:custom Message:key_prefix must only contain letters, numbers, or .-_+=:/#}]
│ 
│   with github_repository_autolink_reference.all["apiv2_PTFY25"],
│   on repository.tf line 189, in resource "github_repository_autolink_reference" "all":
│  189: resource "github_repository_autolink_reference" "all" {

Terraform Version

terraform ">= 1.9.8, < 1.10"
integration "v6.6.0"

Affected Resource(s)

• github_repository_autolink_reference

Terraform Configuration Files

Steps to Reproduce

No response

Debug Output

Panic Output

Code of Conduct

• I agree to follow this project's Code of Conduct

[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! 🚀

[deiga]

Thanks @MarkVaughn for raising this. We weren't aware that such a rule existed on the API.
Would love to see a PR to add this validation! :)