If you get a job with an airline which has one and just one permanent base, then it's obvious where you will be based. The thing is, these jobs are few and far between and are fought for fiercely by experienced, settled pilots who want to spend more time with their families at home and spare themselves the general inconvenience of commuting. However, only a fraction of all pilots are ever this fortunate. The majority have to either relocate multiple times in their careers or commute on some sort of X days/week on, Y days/weeks off scheme. You are where the aircraft are - and the aircraft are where the company needs them to be in order to generate revenues.
If that's of any comfort to you, RYR is very good for its firmly fixed 5/4 roster pattern - and DUB has connections to lots of places on the network. So, you'll have the chance to go home every week while waiting for a vacancy in DUB.