[CI] - Linux unit tests

[jr1221]

Description

Ensure that messages are being parsed with a unit testing framework of sorts.

Acceptance Criteria

Tests the whole round trip of encodable can messages by sending a MQTT message, and decodable can messages by sending a CAN message.

Proposed Solution

Have a bash script to setup vcan0 and mosquitto. Have a rust test which sets up mqtt and can listeners, and runs a few messages through the encoder and decoder and checks on the other side.