rabbit_set_config can break rabbitmq.conf by omitting important new lines

[michaelklishin]

See this RabbitMQ repository discussion. It looks like the rabbit_set_config function should make sure it prepends a newline character to every line it generates. Extra newlines won't hurt but missing newlines can produce an incorrect config file and cause a fair amount of confusion.

Of course, it would be best if this image did not mess with the rabbitmq.conf and retired all environment variable-based configuration values possible but we've had this conversation in #440 and #424 :)

[tianon]

Doh, yep - I bet the reproducer is to have a rabbitmq.conf that's missing a trailing newline and the container try to set an option that doesn't exist, which will append to the file. 😅

(Yes, I'd really love to resolve #424 😬)