docs: add warning about other docker distros

Author: cameri

README.md

@@ -68,10 +68,12 @@ NIPs with a relay-specific implementation are listed here.
 - Typescript
 
 ### Docker setups
-- Node v18
 - Docker v20.10
 - Docker compose v2.10
 
+WARNING: Docker distributions from Snap, Brew or Debian repositories are NOT SUPPORTED and will result in errors.
+Install Docker from their [official guide](https://docs.docker.com/engine/install/) ONLY.
+
 ## Full Guide
 
 - [Set up a Nostr relay in under 5 minutes](https://andreneves.xyz/p/set-up-a-nostr-relay-server-in-under) by [André Neves](https://twitter.com/andreneves) (CTO & Co-Founder At [ZEBEDEE](https://zebedee.io/))