Automatic shell linter for PR

[ludeeus]

https://stickler-ci.com/docs#bash
Can be activated on this repo to automatically check for common mistakes in shell scripts.
Before activating all existing scripts must be validated.

[ludeeus]

All scripts are now compliant for Stickler-CI.
There is 1 issue remaining:

In package/opt/hassbian/suites/homebridge.sh line 64:
RANDOM_MAC=$( for i in {1..6} ; do echo -n ${HEX_CHARS:$((RANDOM % 16)):1} ; done | sed -e 's/\(..\)/:\1/g' )
              ^-- SC2034: i appears unused. Verify it or export it.

Line in question
Docs for SC2034, not sure how to handle that one, @Landrash do you have an idea?