Added callout for magic env on docker compose build section

Author: ShadowArcanist

docs/builds/packs/docker-compose.md

@@ -63,6 +63,12 @@ services:
 <ZoomableImage src="/docs/images/builds/packs/compose/6.webp" />
 
 ### Coolify's Magic Environment Variables
+::: warning HEADS UP!
+As of Coolify v4.0.0-beta.410, Magic Environment Variables are only supported for One-Click Services and Docker Compose-based deployments. 
+
+This means that Git-based Docker Compose deployments are not yet supported. The team is actively working on adding support in future releases of Coolify.
+:::
+
 Coolify can generate dynamic environment variables for you using the following syntax: `SERVICE_<TYPE>_<IDENTIFIER>`. 
 
 The types include: