feat: Add support for Copilot code review in repository rulesets

This change adds support for GitHub's Copilot code review feature in repository rulesets,
allowing automatic code review requests for pull requests.

Changes:
- Add copilot_code_review rule to repository ruleset schema
- Add CopilotCodeReviewRuleParameters and related types to go-github
- Implement expand/flatten logic for copilot_code_review rules

The copilot_code_review rule supports two configuration options:
- review_new_pushes: Automatically review each new push to the PR
- review_draft_pull_requests: Automatically review draft PRs

Both options default to false, matching GitHub UI behavior.

Author: JiayangZhou

github/resource_github_repository_ruleset.go

@@ -584,6 +584,28 @@ func resourceGithubRepositoryRuleset() *schema.Resource {
 								},
 							},
 						},
+						"copilot_code_review": {
+							Type:        schema.TypeList,
+							Optional:    true,
+							MaxItems:    1,
+							Description: "Automatically request Copilot code review for new pull requests if the author has access to Copilot code review and their premium requests quota has not reached the limit.",
+							Elem: &schema.Resource{
+								Schema: map[string]*schema.Schema{
+									"review_on_push": {
+										Type:        schema.TypeBool,
+										Optional:    true,
+										Default:     false,
+										Description: "Copilot automatically reviews each new push to the pull request. Defaults to `false`.",
+									},
+									"review_draft_pull_requests": {
+										Type:        schema.TypeBool,
+										Optional:    true,
+										Default:     false,
+										Description: "Copilot automatically reviews draft pull requests before they are marked as ready for review. Defaults to `false`.",
+									},
+								},
+							},
+						},
 					},
 				},
 			},

github/util_rules.go

@@ -496,6 +496,16 @@ func expandRules(input []any, org bool) *github.RepositoryRulesetRules {
 		rulesetRules.FileExtensionRestriction = params
 	}
 
+	// Copilot code review rule
+	if v, ok := rulesMap["copilot_code_review"].([]any); ok && len(v) != 0 {
+		copilotCodeReviewMap := v[0].(map[string]any)
+		params := &github.CopilotCodeReviewRuleParameters{
+			ReviewOnPush:            copilotCodeReviewMap["review_on_push"].(bool),
+			ReviewDraftPullRequests: copilotCodeReviewMap["review_draft_pull_requests"].(bool),
+		}
+		rulesetRules.CopilotCodeReview = params
+	}
+
 	return rulesetRules
 }
 
@@ -706,6 +716,16 @@ func flattenRules(rules *github.RepositoryRulesetRules, org bool) []any {
 		rulesMap["file_extension_restriction"] = fileExtensionRestrictionSlice
 	}
 
+	// Copilot code review rule
+	if rules.CopilotCodeReview != nil {
+		copilotCodeReviewSlice := make([]map[string]any, 0)
+		copilotCodeReviewSlice = append(copilotCodeReviewSlice, map[string]any{
+			"review_on_push":             rules.CopilotCodeReview.ReviewOnPush,
+			"review_draft_pull_requests": rules.CopilotCodeReview.ReviewDraftPullRequests,
+		})
+		rulesMap["copilot_code_review"] = copilotCodeReviewSlice
+	}
+
 	return []any{rulesMap}
 }