chore(docs): add github_workflow_repository_permissions documentation

Signed-off-by: Ludovic Ortega <ludovic.ortega@adminafk.fr>

website/docs/r/workflow_repository_permissions.html.markdown

@@ -0,0 +1,41 @@
+---
+layout: "github"
+page_title: "GitHub: github_workflow_repository_permissions"
+description: |-
+  Enables and manages Workflow permissions for a GitHub repository
+---
+
+# github_workflow_repository_permissions
+
+This resource allows you to manage GitHub Workflow permissions for a given repository.
+You must have admin access to a repository to use this resource.
+
+## Example Usage
+
+```hcl
+resource "github_repository" "example" {
+  name = "my-repository"
+}
+
+resource "github_workflow_repository_permissions" "test" {
+  default_workflow_permissions = "read"
+  can_approve_pull_request_reviews = true
+  repository = github_repository.example.name
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `repository`                       - (Required) The GitHub repository
+* `default_workflow_permissions`     - (Optional) The default workflow permissions granted to the GITHUB_TOKEN when running workflows. Can be one of: `read` or `write`.
+* `can_approve_pull_request_reviews` - (Optional) Whether GitHub Actions can approve pull requests. Enabling this can be a security risk.
+
+## Import
+
+This resource can be imported using the name of the GitHub repository:
+
+```
+$ terraform import github_workflow_repository_permissions.test my-repository
+```