refactor: add hostname to docker run

run_ros2_galactic.sh

@@ -5,6 +5,7 @@ docker run -d -it \
     --network=host \
     --env DISPLAY=$DISPLAY \
     --privileged \
+    -h galactic \
     -v /tmp/.X11-unix:/tmp/.X11-unix  \
     -v /dev:/dev \
     -v /home/jasper/.config/nvim:/home/jasper/.config/nvim \