“Star Wars: The Force Awakens” star John Boyega has joined the cast of Kathryn Bigelow and Mark Boal’s movie centering on the 1967 Detroit Riots, their untitled follow-up to “Zero Dark Thirty.” Megan Ellison’s Annapurna Pictures is financing with Bigelow and Boal producing along with Ellison and Matthew Budman. Colin Wilson and Greg Shapiro will executive produce....