Use celery config from beacon

Use ewoks celery config instead of ENV to config sidecar.

This can be done with blissdata with a small rework.

Here is an actual ewoks config file

celery:
    broker_url: "redis://lbm05loka:25001/2"
    result_backend: "redis://lbm05loka:25001/3"
    result_serializer: "pickle"
    accept_content: ["application/json", "application/x-python-serialize"]
    result_expires: 600