By Alek Arend It’s been a good July for NFL star wide receiver DK Metcalf. Earlier this week, Metcalf scored a massive new extension with the Seattle Seahawks. Then on Saturday, ESPN’s Adam Schefter announced Metcalf will soon make his acting debut. The Seahawks wide receiver will star alongside Owen Wilson, Jesse Williams and Michael Pena in Jerry Bruckheimer’s upcoming action movie Secret Headquarters. The film premiers on Aug. 12. “Good two-week stretch for Seahawks’ WR DK Metcalf: fresh off his new contract extension, Metcalf will make his acting debut, alongside Owen Wilson, Jesse William…