Allow TCP backend to be configured
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=325084) </details> <!--IssueSummary end--> Workhorse needs to be able to talk to gitlab-rails (Unicorn). Currently we have two ways of doing that: - with TCP at `http://localhost:8080` - with Unix sockets at a configurable socket path What's missing here is connecting to gitlab-rails with TCP at an arbitrary address. We may want this for cloud-native deployments. cc @marin
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