Add disclaimer about docker support in MacOS

Author: nbialostosky

jekyll/_cci2/docker-compose.md

@@ -73,6 +73,10 @@ Using `docker` combined with `setup_remote_docker` provides a remote engine simi
 
 This combination is required if you want to build docker images for deployment. 
 
+## Using Docker Compose with macOS Executor (not supported)
+
+At the moment we [don't support utilizing docker](https://support.circleci.com/hc/en-us/articles/360045029591-Can-I-use-Docker-within-the-macOS-executor-) within the `macos` executor.
+
 ## See Also
 {:.no_toc}