Alex Garland's feature helming debut, Ex Machina, was picked up for U.S. distribution by A24 on Wednesday, just in time for the first trailer to drop. Garland, who penned 28 Days Later and Sunshine, also wrote the psychological thriller that stars Domhnall Gleeson, Oscar Isaac and Alicia Vikander. Gleeson plays a 24-year-old coder at the world's largest Internet company who wins a competition to spend a week at a retreat belonging to the company's reclusive CEO (Isaac)…