If I update my flow environment on dockerhub and there is no change in the flow file (the one in github storage) Do I still need to re-register all my flows?

No, you don’t, provided that the image name and tag on the run config is the same. If this changed, then you would need to reregister because run config is part of the metadata stored in the backend and tied to the specific flow version.

Alright, thank you for the help.