Potential Issues

julia binaries are located in a different folder than /usr/bin

In such a case you may try to hint to the binary as:

#!/opt/julia/bin/env julia

Then after making your script to make it executable with:

$ chmod a+x main.jl

You kick off a roscore and run:

$ rosrun bot_description main.jl

With the resulting error:

/opt/ros/kinetic/bin/rosrun: /home/febbo/catkin_ws/src/bot_description/main.jl: /opt/julia/bin: bad interpreter: Permission denied
/opt/ros/kinetic/bin/rosrun: line 109: /home/febbo/catkin_ws/src/bot_description/main.jl: Success

Then after making sure that the binary is in the correct location:

$ /opt/julia/bin/julia -e 'println("Hello world")'
Hello world

A fix is to make a link to the binary in the usr/bin directory