Running rspec tests in a Docker container on circleci

In our continous integration pipeline, we are using github, circleci, docker and the Docker Hub. Here is how it goes: a developer pushes to github, circleci pulls the repository, builds a container, runs the rspec tests in that container and then deploys it. However, when we first ran docker run myorg/container bundle exec rspec in circleci we faced the following error: Failure/Error: Unable to fi