Pete Buttigieg’s political donors scored city contracts worth millions after giving big bucks to his campaign for mayor of South Bend, Indiana — raising concerns over “pay to play” deals as he dishes out funds for the national infrastructure package, according to a report and public records. The transportation secretary’s mayoral political action committees accepted money from at least 23 companies that were later awarded more than $33 million in contracts for city projects, according to the Daily Mail, along with some documents confirmed by The Post.