Digital marketing software firm Ibotta Inc. filed for an initial public offering on the heels of this week’s successful debuts by Reddit Inc. and Astera Labs Inc.The Denver-based company, which helps brands to deliver mobile promotions through rewards and rebates, said in a filing Friday that it turned a profit last year, reversing earlier losses. Ibotta, whose investors include Walmart Inc., will disclose proposed terms for its IPO in a later filing....