OpenAI is developing an alternative to GitHub, Microsoft’s popular code repository that lets software engineers store, share and collaborate on computer code, according to a person with knowledge of the project. The decision to embark on the new product came after OpenAI engineers, like other GitHub customers, experienced an increase in outages that took GitHub offline in recent months. Those outages prevented engineers from making changes or collaborating on code for anywhere from a few minutes to a few hours, said two people working at large customers that experienced the outages.