Easily deploy your new OpenELEC image

If the DEPLOY_TO_OPENELEC_APPLIANCE variable is defined in the
environment, (it should contain the IP/hostname of your OpenELEC
appliance), at the end of the building process the newly built image
would be uploaded automatically over SCP to it. The /flash filesystem
will be temporarily remounted in read-write mode to make this transfer
possible. It is recommended that you configure SSH key login to the
appliance.

If the variable is not defined a message would be shown, telling the
user about the existence of this possibility.