Add a Basic API test route
To help develop the Pipelines summary page on the web app. The webapp will query the /api/pipelines
route to get the json that lists pipelines which ran recently.
Once that is working well we can add more API routes for pipelines, pipeline tests
Relates to https://gitlab.cern.ch/lhcb-dpa/project/-/issues/139 developments.
Edited by Ryunosuke O'Neil