This will help us fail fast and prevent unnecessary builds for code which would fail basic linting.

There's no point running e2e tests if we're not confident other parts of the application are working.

When we get proper caching in place this will run in series after pytest as well, but for the moment we keep it in parallel to keep CI runtimes down.

This is now the default, it's just adding noise to the build process.

This should dramatically speed up the process of building the stack since unchanged layers can be reused from previous build operations.

We build the exact same image for both pytest and e2e, so use it in both.

This was trying to build all services, but we don't actually need things like the local docs for this. Only launch `django` and its dependencies.