What is the ruling on working in a restaurant that serves alcohol, knowing that my work will not be related to alcohol, and is the money earned from it Haram (forbidden) or Makruh (disliked)?

There is no harm in working at a restaurant that serves alcohol, as long as you do not directly sell it, carry it, or serve it, and do not directly assist in its handling. However, it is preferable to avoid working in such places to distance oneself from direct involvement in a forbidden act. As for the salary from mixed funds, it is permissible, as it is permissible to deal with someone whose wealth is mixed. Furthermore, necessity dictates special rulings that permit otherwise forbidden work.