New bike disc brake noise
The brakes should be adjusted. The disc caliper mounting bolts allow a small amount of adjustment to center the pads between the disc rotor. Your caliper is likely misaligned allowing the rotor to rub on the pads. If the rubbing sound is cyclic meaning it rubs then stop at the same place each wheel rotation the cause is more likely a warped rotor. Another potential issue is the axle not fully seated in the dropout resulting in a slight misalignment.