Add json fields to the RepositoryRule object

The purpose of this commit is to allow further querying of rulesets
for a specific branch, at the organization or the repository level.
To achieve this, this commit adds the `ruleset_id` and `ruleset_source_type`
fields to the RepositoryRule object according to the returned information
from the github API.

github/repos_rules.go

@@ -112,8 +112,11 @@ type RequiredWorkflowsRuleParameters struct {
 
 // RepositoryRule represents a GitHub Rule.
 type RepositoryRule struct {
-	Type       string           `json:"type"`
-	Parameters *json.RawMessage `json:"parameters,omitempty"`
+	Type          string           `json:"type"`
+	Parameters    *json.RawMessage `json:"parameters,omitempty"`
+	SourceType    string           `json:"ruleset_source_type"`
+	RulesetSource string           `json:"ruleset_source"`
+	RulesetID     int64            `json:"ruleset_id"`
 }
 
 // UnmarshalJSON implements the json.Unmarshaler interface.
@@ -125,6 +128,9 @@ func (r *RepositoryRule) UnmarshalJSON(data []byte) error {
 		return err
 	}
 
+	r.RulesetID = RepositoryRule.RulesetID
+	r.SourceType = RepositoryRule.SourceType
+	r.RulesetSource = RepositoryRule.RulesetSource
 	r.Type = RepositoryRule.Type
 
 	switch RepositoryRule.Type {

github/repos_rules_test.go

@@ -262,9 +262,11 @@ func TestRepositoriesService_GetRulesForBranch(t *testing.T) {
 		testMethod(t, r, "GET")
 		fmt.Fprint(w, `[
 			{
+			  "ruleset_id": 42069,
 			  "type": "creation"
 			},
 			{
+			  "ruleset_id": 42069,
 			  "type": "update",
 			  "parameters": {
 			    "update_allows_fetch_and_merge": true
@@ -280,9 +282,11 @@ func TestRepositoriesService_GetRulesForBranch(t *testing.T) {
 	}
 
 	creationRule := NewCreationRule()
+	creationRule.RulesetID = 42069
 	updateRule := NewUpdateRule(&UpdateAllowsFetchAndMergeRuleParameters{
 		UpdateAllowsFetchAndMerge: true,
 	})
+	updateRule.RulesetID = 42069
 
 	want := []*RepositoryRule{
 		creationRule,