ci(lint): enable gci linter

[mmorel-35]

Order imports and places github.com/opencontainers modules at last.

Signed-off-by: Matthieu MOREL matthieu.morel35@gmail.com

[sudo-bmitch]

Is there any advantage of going with the gci linter over the builtin goimports tool? E.g. goimports -w -local github.com/opencontainers . makes the same ordering change.

[mmorel-35]

It seems like goimports only handle the local import why gci is more flexible as you can define more rules.
But for the most common use which is to have the local import at last they behave the same way. And in that case it is more a matter of habit.