[Bug]: Update external mongodb examples to use mongodb v8

[mbentley]

Controller Version

n/a

Describe the Bug

https://github.com/mbentley/docker-omada-controller/blob/master/external_mongodb/docker-compose_fresh-install-bridge.yml
https://github.com/mbentley/docker-omada-controller/blob/master/external_mongodb/docker-compose_fresh-install-host.yml

Expected Behavior

They should use v8 by default.

Steps to Reproduce

n/a

How You're Launching the Container

Compose

Container Logs

n/a

MongoDB Logs

Additional Context

No response

[mathieuruellan]

What is the minimal version required for mongodb with sdn v6?
(can be important for users without avx)

[mbentley]

As of the 6.0.0.24 release notes it's MongoDB 3.0-8.0

[imc67]

As of the 6.0.0.24 release notes it's MongoDB 3.0-8.0

Doe this mean your docker version can still use the MongoDB from version 5, so there shouldn’t be any issues on a RaspberryPi 4b?

[mbentley]

My Docker image only includes MongoDB 8.x but you can run it along side the controller container. Any migration from MongoDB 3.x would need to be done manually as I do not have a migration script that stops before 8 but you could modify the existing one I suppose. MongoDB starting with 5.x require the new features so you would need to run 4.x.