Rewrite CircleCI config for CircleCI 2.0
Rewrite CircleCI config for CircleCI 2.0

Make changes to the config file to use CircleCI 2.0's workflows and
provide one job used to build the Docker image.

DudLab/docker_nanshe_workflow,DudLab/docker_nanshe_workflow,nanshe-org/docker_nanshe_workflow,nanshe-org/docker_nanshe_workflow