Most GBs have an outside tap. You can connect a hose directly to that tap and it will bypass the pump and provide city water throughout the boat. You will need a pressure regulator and a male to male hose adapter from any hardware store. The regulator must be installed at the dock end of the hose.
That said, I do not recommend using a dockside connection. I prefer filling the tanks as needed. We live aboard and always fill our water tank. In 12 years of live aboard I’ve experienced 3 water leaks onboard that could have flooded the boat had we been connected to city water and had not shut the dockside water at night or when we were off the boat.