Add `run` and `params` field (dagucloud#573)

* rename config variable command -> executable

* Add sub workflow feature

* Update API for adding 'run' and 'params'

fix https configuration errors (dagucloud#541)

fix race problem

Fix command flag duplication issue (dagucloud#522)

* fix command flag duplication issue

* fix test

Update docs (dagucloud#512)

* fix doc

* fix basic auth middleware

* update docs

add start-all command (dagucloud#498)

fix build

remove protobuf gen part from the release workflow

fix basic auth issue (dagucloud#483)

fix api base url to be the same host (dagucloud#482)