lintをGitHub Actions でするように (#6101)

* package.json の lint スクリプトを修正

* lint アクションを追加

* yarn lint --fix

* 手動修正

src/models/repositories/user.ts

@@ -98,7 +98,7 @@ export class UserRepository extends Repository<User> {
 
 	public async getHasUnreadAntenna(userId: User['id']): Promise<boolean> {
 		const antennas = await Antennas.find({ userId });
-		
+
 		const unread = antennas.length > 0 ? await AntennaNotes.findOne({
 			antennaId: In(antennas.map(x => x.id)),
 			read: false
@@ -112,7 +112,7 @@ export class UserRepository extends Repository<User> {
 			muterId: userId
 		});
 		const mutedUserIds = mute.map(m => m.muteeId);
-	
+
 		const count = await Notifications.count({
 			where: {
 				notifieeId: userId,