Add support docker machine web terminal support (!1046) · Merge requests · GitLab.org / gitlab-runner · GitLab

What does this MR do?

Follow up of !1008 (merged) to add docker machine support.

Why was this MR needed?

Adding support for docker+machine for #3467 (closed)

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

Documentation created/updated
Added tests for this feature/bug
In case of conflicts with master - branch was rebased

What are the relevant issue numbers?

Closes #3467 (closed)