Augmenting a steering wheel using the onboard jetbot motors

hello dear community,
im experimenting with modifying robot.py to dedicate one of the motors for steering and keeping the other as is.

        def forward(self, speed=1.0, duration=None):
            #self.left_motor.value = speed
            self.right_motor.value = speed

        def backward(self, speed=1.0):
            #self.left_motor.value = -speed
            self.right_motor.value = -speed

        def left(self, speed=1.0):
            self.left_motor.value = -speed
            #self.right_motor.value = speed

        def right(self, speed=1.0):
            self.left_motor.value = speed
            #self.right_motor.value = -speed

i followed issue #372 on github and ran the following set of commands on the terminal before rebooting. but didnt seem to apply the changes

cd docker
./disable.sh
./configure.sh
./build.sh
./enable.sh