Missing documentation on how to include source code

[TheCaffinatedDeveloper]

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Description

I could not find from the documentation what should be a simple item. I understand that the pytest-celery plugin is managing the creation of /app directory and injecting it into the worker container. That's great and all, but it's not including the code that the tasks depend on from the project. I tried using a custom dockerfile to copy the project source code into /app but it get's overidden completely. What is the best way to ensure all the source code get's included in the test worker container and not just the files which contain tasks?

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