Add DicussionCommentEvent Webhook (google#2678)

Fixes: google#2497.

github/event.go

@@ -53,6 +53,8 @@ func (e *Event) ParsePayload() (payload interface{}, err error) {
 		payload = &DeploymentStatusEvent{}
 	case "DiscussionEvent":
 		payload = &DiscussionEvent{}
+	case "DiscussionCommentEvent":
+		payload = &DiscussionCommentEvent{}
 	case "ForkEvent":
 		payload = &ForkEvent{}
 	case "GitHubAppAuthorizationEvent":

github/event_types.go

@@ -189,6 +189,39 @@ type DeploymentStatusEvent struct {
 	Installation *Installation `json:"installation,omitempty"`
 }
 
+// DiscussionCommentEvent represents a webhook event for a comment on discussion.
+// The Webhook event name is "discussion_comment".
+//
+// GitHub API docs: https://docs.github.com/webhooks-and-events/webhooks/webhook-events-and-payloads#discussion_comment
+type DiscussionCommentEvent struct {
+	// Action is the action that was performed on the comment.
+	// Possible values are: "created", "edited", "deleted". ** check what all can be added
+	Action       *string            `json:"action,omitempty"`
+	Discussion   *Discussion        `json:"discussion,omitempty"`
+	Comment      *CommentDiscussion `json:"comment,omitempty"`
+	Repo         *Repository        `json:"repository,omitempty"`
+	Org          *Organization      `json:"organization,omitempty"`
+	Sender       *User              `json:"sender,omitempty"`
+	Installation *Installation      `json:"installation,omitempty"`
+}
+
+// CommentDiscussion represents a comment in a GitHub DiscussionCommentEvent.
+type CommentDiscussion struct {
+	AuthorAssociation *string    `json:"author_association,omitempty"`
+	Body              *string    `json:"body,omitempty"`
+	ChildCommentCount *int       `json:"child_comment_count,omitempty"`
+	CreatedAt         *Timestamp `json:"created_at,omitempty"`
+	DiscussionID      *int64     `json:"discussion_id,omitempty"`
+	HTMLURL           *string    `json:"html_url,omitempty"`
+	ID                *int64     `json:"id,omitempty"`
+	NodeID            *string    `json:"node_id,omitempty"`
+	ParentID          *int64     `json:"parent_id,omitempty"`
+	Reactions         *Reactions `json:"reactions,omitempty"`
+	RepositoryURL     *string    `json:"repository_url,omitempty"`
+	UpdatedAt         *Timestamp `json:"updated_at,omitempty"`
+	User              *User      `json:"user,omitempty"`
+}
+
 // DiscussionEvent represents a webhook event for a discussion.
 // The Webhook event name is "discussion".
 //