Update binary path + ENTRYPOINT.
Update binary path + ENTRYPOINT.

The latest viper version has a change in detecting the location of the
configuration file and fails with:
Fix Unsupported Config Type \"\""

This is because the name of the binary is the same as the configuration
filename and viper detected the binary as configuration file (as a
config file in workdir has priority over /etc/...).

brocaar/lora-semtech-bridge,brocaar/lora-gateway-bridge,brocaar/lora-semtech-bridge,brocaar/lora-gateway-bridge