Starting Workspace results in HTTP Response from internal Registry

Hi everyone,
i’ve just setup a selfhosted GitPod 0.10.0 on a single node Cluster.
I’ve got it to authenticate with a selfhosted GitLab instance but now when opening a workspace i get a “Request startWorkspace failed with message: 13 INTERNAL: cannot resolve workspace image: Error response from daemon: Get https://registry.gitpod.xxx.de/v2/: http: server gave HTTP response to HTTPS client”

Has anyone else have this problem, ore someone knows what to change in the values-custom.yaml ?

Thanks in advance
Felix