Who knows about slogging over a 9-to-5 better than Dolly Parton? The queen of country music, whose 1980 hit “9 to 5” became an enduring anthem for working Americans, is now entering the coffee business with the launch of a new brand, aptly named Cup of Ambition. Announced Thursday, the coffee line is a partnership between Parton and Louisiana-based Community Coffee, a family-owned roaster founded in 1919. The initial collection includes light, m…