I have pulled the docker image but it does not run

Looks like it is missing dockerfile, how can i add dockerfile to existing image?

Not at all … The “Dockerfile” never makes it into the container. It’s more a recipe of “how to create the container”

What is your cmd to run the container ? (docker run …)

what does “docker logs < id of container >” give you ?

Puh … this seems more a problem of awsels/frontend-base rather than of docker …
From the error message I’d suspect that Ruby is not or only partial installed. But I don’t know “awsels” … so I can’t give you a decent suggestion.
You should contact the maintainer of the container to resolve this issue.