(Photo by Courtney Sacco) Jim Koch (center), founder of the JP-based Boston Brewing Company, maker of Samuel Adams beer, shares a laugh and a drink with four-time Boston Marathon champion Bill Rodgers (right) as Boston Athletic Association Joann Flaminio (left) looks on during a Feb. 23 announcement of a new Marathon-themed beer at the company’s headquarters in The Brewery on Germania Street. The one-batch “Boston 26.2” brew, named for the miles in a marathon, will be available only in Boston, only in kegs and only around the time of the April 16 Boston Marathon.