[WIP] Bootstrap end to end tests with cypress
Setup an environment to perform end to end tests using the cypress Test Runner.
Before running the tests, Software Heritage web application is executed in the
background using in-memory storages for fetching data contained in a sample archive.
To easily run the tests, two new make targets have been added:
- test-frontend: Run tests in headless mode (this should be used in a CI environment)
- test-frontend-ui: Run tests using the cypress GUI
As an example, a couple of tests regarding the highlighting of lines of code have been added.
Subscribers: shisus, kalpitk
Differential Revision: https://forge.softwareheritage.org/D1565