Support for recordings about b3scale HOT 4 CLOSED

The API is already implemented.

I already had concerns about the storage, but was told not to worry so much about it.
(e.g. having different shares for unpublished / published recording, as the operation is pretty much a mv, which is costly across networks.)

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Right now the security relies on not knowing the internal meeting id. I kind of do not like this too much. I think we should at least hash it with a secret or something.

The configuration environment variables for recording are already documented in the readme.

B3SCALE_RECORDINGS_PUBLISHED_PATH 
required if recordings are supported: This points to the shared path where
published recordings are. Example: /ceph/recordings/published

B3SCALE_RECORDINGS_UNPUBLISHED_PATH
recordings are moved here, when unpublished Please note that in both directories the
subfolder for the format should be present. (e.g. /ceph/recordings/unpublished/presentation) 
Example: /ceph/recordings/unpublished

B3SCALE_RECORDINGS_PLAYBACK_HOST
path to host with the player. For example: https://playback.mycluster.example.bbb/

from b3scale.

Right now the security relies on not knowing the internal meeting id.

This is btw. the case for BBB without b3scale.
Again I have a bit of a bad feeling about this.

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This is implemented since 0.14.1. Closing.

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