Arvados

To fully support CWL, we need to be able to start CWL workflows from workbench. This involves:

• Pick the CWL workflow to start from
  • Decide whether to store workflows in git or Keep
  • We already have a chooser for selecting files from Keep
• Create pipeline instance
  • Can contain single job that executes workflow runner (see #7583)
• Generate workbench user interface from CWL workflow inputs
  • Can convert CWL input parameters to Arvados pipeline parameter spec, but won't be able to handle some types of CWL inputs.