fix: always reference trusty as default
fix: always reference trusty as default

It is currently where we run CI, so I trust - heh - that as a default more than anything else

progrium/dokku,alexquick/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,dokku/dokku,alexquick/dokku,alexquick/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,alexquick/dokku,progrium/dokku,progrium/dokku,dokku/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,progrium/dokku,jimjag/dokku,jimjag/dokku,alexquick/dokku,jimjag/dokku,jimjag/dokku,dokku/dokku,claytonbrown/dokku,alexquick/dokku,alexquick/dokku,jimjag/dokku,jimjag/dokku,progrium/dokku,claytonbrown/dokku,jimjag/dokku,alexquick/dokku,dokku/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,jimjag/dokku