Checkmk Werk 11871: Docker container: Add git client to support setup git integration

ID: 11871 Title: Docker container: Add git client to support setup git integration Component: Core & setup Level: 1 Class: Bug fix Version: 2.1.0i1 To make it possible to use the git integration of the setup (WATO) in the Checkmk docker container, we now ship the git client with the docker container by default.