I ended up in a managerial position at my company somewhat against my wishes due to various circumstances and I don't know how to reconcile this with my leftist beliefs. I do what I can to give my team raises whenever possible, and encourage everyone to take as much time off as possible, but I can't help but feel like a traitor to the cause. I have a mortgage and a kid on the way so leaving this job isn't really an option, but how else can I be a ally to the worker movement?
You are still a worker, being a manager doesn't make you a class traitor automatically. I'd rather have class conscious manager than otherwise.
Do everything you can to make the job easier for the people you manage and always be on their side and etc which is what you say you are doing.
Agitate for unionisation and/or raise class conciousness.
Launder your guilt by initiating or joining mutual aid/commies in your area.