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I've added a very basic selenium test, alongside the necessary changes to the CI, requirements.txt, and Dockerfile to make it work locally and in CI.
So far, this just checks that the main pages (as listed in the navigation bar) do not 404, have a Django ProgrammingError page displayed, etc. The test uses the Chromium webdriver because it is more complex to set up one test to run with two different webdrivers in sequence. It also opts for emulating the common desktop resolution of 1080p (future tests could check that the navbar expander, etc., work properly, but this is out of scope for test # 1).