I'm annoyed to scroll when I'm debugging the build server logs. I think,
if you run `jest` with an environment variable `CI` set to true, it will
not try to output colorized log and also does not output which test it's
currently running.
That should lead to the desired, smaller log on Travis CI.
* Use `production` docker images for cypress tests. As one of our contributors
pointed out: It is bad practice to end-to-end test sth. else than the actual
production images.
* Have a dedicated `docker-compose.travis-integration.yml` to test
backend integration tests. The backend *needs* a database when doing
integration tests. So there is no way around using docker-compose. But
we could stop using the `build-and-test` stage when we do cypress tests.
* Remove a couple of unused ports and DRY `docker-compose.override.yml`
* Build and tag all images first and then run `docker-compose .. up` - I
hope this will not rebuild the image.
* Reduce docker image size
