LiveKit offers Universal Egress, designed to provide universal exports
of LiveKit sessions or tracks to a file or stream data.
Egress is kept outside of the server to keep the load off the SFU and avoid
impacting real-time audio or video performance/quality.
Followed the "Running Locally" steps from the https://github.com/livekit/egress
repository, but I adapted them to docker-compose.
By default, I chose to run both the LiveKit server and the Egress when you
up the stack. If we see any performance issue, we could only run the LiveKit
server, which is the barebone of the product.
Egress will be usefull only when dealing with recording/exporting data.
Egress service will output file recordings to "./docker/livekit/out"
Note: the Egress service doesn't run as root. You need to update the "/out"
permissions, so all user could write to it.
LiveKit server configuration was the default ones. These configurations
were not connecting to any Redis instance. When running a standalone
LiveKit server, Redis is not needed.
However, when adding other LiveKit ecosystem service, e.g. Egress,
LiveKit server publish jobs to a Redis queue, that are handled by
the Egress workers.
(Precisely, they use Redis Pub/Sub to communicate but I am no expert)
The LiveKit server and the Egress need to be connected to the same
Redis instance. This commit configure the LiveKit server before
adding the Egress service to the compose stack.
