Stop building config files into the rabbitmq image

[MoralCode]

Currently we take credentials and settings available as build-time environment variables and use those as part of the rabbitmq image build process to bake in the config into the container image.

that, in addition to being a questionable security practice, makes it harder for instances to change their rabbitmq credentials.

This may also make the migration to CollectOSS harder

[deepanshutiwari27]

@MoralCode please assign this issue to me