Test docker-compose.yml with multiple interfaces exposed

[shawaj]

Previously docker-compose.yml files with unavailable interfaces (such as i2c-7 on a raspberry pi) would fail to build on that device.

It seems that this might have been changed/fixed in balena but we need to test this further

Relates-to: #385

[shawaj]

@marvinmarnold i tested this today on a rak unit - it does not seem to be a balena restriction per se.

The diagnostics container ran fine with both i2c-1 and i2c-7 exposed

miner container didn't - however perhaps it is due to diagnostics having privileged: true will test further

[shawaj]

ok @marvinmarnold confirmed - if you have privileged: true you can have i2c-1 and i2c-7 declared and the containers will still run

if you do not have privileged: true then the containers hang

[shawaj]

Resolved in #414

[shawaj]

In fact, further to this, @MuratUrsavas has shown in #414 that we don't even need to declare the i2c devices if we use privileged: true

#414 (comment)

[shawaj]

Also see #385 (comment)