There’s more than one way to do it. With plug-ins, Medeek’s truss/roof plug-in seems to just crank out such a roof with parametrics. I haven’t gotten or used it myself as yet, so I can’t speak from experience.
It’s relatively straight forward because the plate heights are all the same. Without plug-ins, one way is to draw one half a typical roof sections as a closed shape, draw a path along the top wall plate and use follow me to extrude the roof section along that path. That will generate hips and valleys, but you still have to come back and clean up what ever runs short of long.