Cml runner should not need to need git if repo is given

Launch the runner from a non git folder is desirable. This issue is unexpected to me since I remember to launch the runner from not git folders.

```sh
cml-runner --token $TOKEN --repo $REPO --labels cml-runner --dockerVolumes="$(pwd):/home/.cml"
error: Command failed: git config --get remote.origin.url {"output":[null,{"data":[],"type":"Buffer"},{"data":[],"type":"Buffer"}],"pid":13244,"signal":null,"status":1,"stderr":{"data":[],"type":"Buffer"},"stdout":{"data":[],"type":"Buffer"}}
```