Add ENTRYPOINT and CMD

[mshriver]

Have the container run like an executable, with CLI options overriding the --help command.

Build Layers

STEP 15/16: ENTRYPOINT ["swach"]
--> Using cache b9a32b37f253bff377b20eb3a3e0bbd5d758bbeed83e4d007eebe2a5c9d6dfe7
--> b9a32b37f253
STEP 16/16: CMD ["--help"]
--> Using cache 76aa005c89d9becefcb0a74cffd916b9b8c624902511c1051d5fc4620e797dbd
COMMIT local-cloudwash
--> 76aa005c89d9
Successfully tagged localhost/local-cloudwash:latest
76aa005c89d9becefcb0a74cffd916b9b8c624902511c1051d5fc4620e797dbd

Default Entry

(.cloudwash_venv) ➜  cloudwash git:(add-entrypoint) podman run localhost/local-cloudwash             
Usage: swach [OPTIONS] COMMAND [ARGS]...

  A Cleanup Utility to remove the VMs, Discs and Nics from Providers!

Options:
  --version  Get installed version of cloudwash in system
  -d, --dry  Only show what will be removed from Providers!
  --help     Show this message and exit.

Commands:
  aws        Cleanup Amazon provider
  azure      Cleanup Azure provider
  gce        Cleanup GCE provider
  openstack  Cleanup OSP provider
  rhev       Cleanup RHEV provider
  vmware     Cleanup VMWare provider

CMD override

(.cloudwash_venv) ➜  cloudwash git:(add-entrypoint) podman run localhost/local-cloudwash --version
Version: 0.0.0
Settings File: /opt/app-root/src/cloudwash/settings.yaml