fix: add back repository field in package struct

Ref: google#3515 (comment)

Author: jBouyoud

github/github-accessors.go

@@ -11,14 +11,15 @@ import (
 
 // Package represents a GitHub package.
 type Package struct {
-	ID          *int64     `json:"id,omitempty"`
-	Name        *string    `json:"name,omitempty"`
-	PackageType *string    `json:"package_type,omitempty"` // One of "npm", "maven", "rubygems", "docker", "nuget", "container". For webhook events "container" is "CONTAINER"
-	HTMLURL     *string    `json:"html_url,omitempty"`
-	Visibility  *string    `json:"visibility,omitempty"`
-	Owner       *User      `json:"owner,omitempty"`
-	CreatedAt   *Timestamp `json:"created_at,omitempty"`
-	UpdatedAt   *Timestamp `json:"updated_at,omitempty"`
+	ID          *int64      `json:"id,omitempty"`
+	Name        *string     `json:"name,omitempty"`
+	PackageType *string     `json:"package_type,omitempty"` // One of "npm", "maven", "rubygems", "docker", "nuget", "container". For webhook events "container" is "CONTAINER"
+	HTMLURL     *string     `json:"html_url,omitempty"`
+	Visibility  *string     `json:"visibility,omitempty"`
+	Owner       *User       `json:"owner,omitempty"`
+	Repository  *Repository `json:"repository,omitempty"`
+	CreatedAt   *Timestamp  `json:"created_at,omitempty"`
+	UpdatedAt   *Timestamp  `json:"updated_at,omitempty"`
 
 	// The following are only populated for webhook events
 	Namespace      *string          `json:"namespace,omitempty"`

github/github-accessors_test.go

@@ -690,6 +690,7 @@ func TestPackage_Marshal(t *testing.T) {
 			CreatedAt:       &Timestamp{referenceTime},
 			SuspendedAt:     &Timestamp{referenceTime},
 		},
+		Repository:  &Repository{ID: Ptr(int64(1))},
 		CreatedAt:   &Timestamp{referenceTime},
 		UpdatedAt:   &Timestamp{referenceTime},
 		Namespace:   Ptr("n"),
@@ -836,6 +837,9 @@ func TestPackage_Marshal(t *testing.T) {
 			"suspended_at": ` + referenceTimeStr + `,
 			"url": "u"
 		},
+		"repository": {
+			"id": 1
+		},
 		"created_at": ` + referenceTimeStr + `,
 		"updated_at": ` + referenceTimeStr + `,
 		"namespace": "n",