Pipeline upload screen

[jennydaman]

The ChRIS_store backend supports POST request to create and store pipelines (a chain of multiple plugins, with parameters). We need to implement a user interface for creating plugins.

Easiest solution: allow pipeline JSON to be uploaded. Front-end makes a POST request to chrisstore.co/api/v1/pipelines/. Example: https://github.com/FNNDSC/CHRIS_docs/blob/master/pipelines/fetal_brain_reconstruction.sh

~~We are debating a new proposal: add a page featuring a drag-and-drop interface where users can design pipelines in the ChRIS_store_ui. If logged in, user should be able to save the pipeline to the ChRIS_store. Ideally, the widget for this should be coded up as a reusable React component — one day we might want to port it into https://github.com/FNNDSC/ChRIS_ui/~~

~~Arguments against the new proposal: user cannot execute test-run of pipelines designed in the ChRIS_store_ui without importing the pipeline into ChRIS first. The feature of designing pipelines should only be available in ChRIS_ui, and the only way to upload pipelines to the ChRIS_store should be via a publish or import/export mechanism invoked from ChRIS.~~

Regarding above, see https://github.com/FNNDSC/ChRIS_ui/issues/269

[jennydaman]

Related to #223

[mairin]

@EUGINELETHAL This is something you're working on now, is that correct? Is it tracked in another issue or would you like to self-assign here?

[EUGINELETHAL]

yah am working on this right now, and yes I can self-assign it here