eds wf pipeline: add run (the API can start a pipeline) #31

eds wf pipeline has only list and show, and eds wf run only list, show and stop. The Workflow Studio API can start a pipeline (POST /workflow/v1/project/{project}/pipeline/{id}/run?branch=<branch>). That is useful for custom pipelines, e.g. a build-only one, that are not tied to eds wf app deploy.

Request

eds wf pipeline run <id> [--branch B] [--wait], returning the run id.

Creating or editing pipelines from the CLI would also help: today custom pipelines can only be made in the Workflow Studio UI.