Forward the DOCKER_HOST env-var from JupyterHub to BinderHub/repo2docker to make it easier to test when the docker socket is in a non-standard location (e..g Podman)
Add an AUTHENTICATOR=dummy env-var to make it easier to test BinderHub authentication
DOCKER_HOST
env-var from JupyterHub to BinderHub/repo2docker to make it easier to test when the docker socket is in a non-standard location (e..g Podman)AUTHENTICATOR=dummy
env-var to make it easier to test BinderHub authenticationThis was useful for testing https://github.com/jupyterhub/binderhub/pull/1847