hms_mqtt_publisher - Add 'mirror' deployment method

[bellackn]

Is your feature request related to a problem? Please describe.
Right now, you need to provide a local file path to the hms-mqtt-publish binary to deploy it.

Describe the solution you'd like
It would be cool to also have the option to pass a URL.

Describe alternatives you've considered
A more direct link to the hms-mqtt-publisher build process maybe, but that's kind of hard to achieve because of cross-compiling issues.

Additional context