Jack Black has joined the cast of ‘Minecraft’. The actor and singer is set to appear in the upcoming video game adaptation – which features Jason Momoa as the lead – and has seemingly confirmed the news. Deadline claimed he has been cast as a character called Steve, although the film’s plot details are still being kept under wraps with writing credits yet to be revealed. Following the report, the Tenacious D rocker shared a photo on Instagram of himself reading a ‘Minecraft Basics for Dummies’ book. He captioned the wrote: “An actor prepares.” The movie is also set to star Emma Myers, Danielle…