Add a warning in the readme.md

[Motophan]

Something to the effect of

"This does not work"

ERROR: The Compose file './docker-compose.yml' is invalid because:
services.nextcloud.labels contains an invalid type, it should be an object, or an array

[mschoettle]

I assume you are referring to nextcloud/docker-compose.yml. There is no service called nextcloud. How does your compose file look, did you use the one from this repo as is? Please provide more detail.