It’s no secret that the Red Sox are in need of rotation depth right now. Even before accounting for injuries, trading away David Price meant that a guy like Ryan Weber was going to have to jump in as the team’s fifth starter all season as the roster stood then. When you add in the injury to Chris Sale and the uncertainty of his timeline, never mind the injury histories of guys like Nathan Eovaldi and Eduardo Rodriguez, and there’s a desperate need for depth. The team addressed that on Thursday, signing former Astro Collin McHugh to a one-year deal.