Fix CI - for warning
Fix CI - for warning

Fix `shellcheck docker-daemon-on-machine-start` by
[ignoring](https://github.com/koalaman/shellcheck/wiki/Ignore#ignoring-one-specific-instance-in-a-file)
[error](https://github.com/koalaman/shellcheck/wiki/Sc2046) as
[recommended](https://github.com/koalaman/shellcheck/issues/1002#issuecomment-328725920):
> There are other ways this do not rely on word splitting; consider using them instead. (Arrays, functions.)
> It is perfectly valid to disable Shellcheck's warnings; they exist to catch naïve errors, not to demand conformance.

lucafavatella/docker-bin