add tag and branch while upgrade ComfyUI

there are more and more issues occured when i upgrade comfyui, some custom nodes are not work well now and throw exceptions, while these custom nodes worked well before, then i have to pay lots of time to repair or rollback comfyui to earlier version !!!

my suggestion is periodly issue a stable branch or tag, avoid lots of unnecessary work to maintenance and adapter existing custom nodes, hope @comfyanonymous would consider this !

really appreciate @comfyanonymous and team do the great cool ComfyUI , and continous contribution !!!