Added env. MACOS (#3297)

### What problem does this PR solve?



### Type of change


- [x] Documentation Update

docker/.env

@@ -92,4 +92,5 @@ TIMEZONE='Asia/Shanghai'
 # Uncomment the following line if you have limited access to huggingface.co:
 # HF_ENDPOINT=https://hf-mirror.com
 
-
+# Uncomment the following line if your OS is MacOS:
+# MACOS=1

docker/README.md

@@ -108,6 +108,8 @@ The [.env](./.env) file contains important environment variables for Docker.
   The local time zone. Defaults to `'Asia/Shanghai'`.
 - `HF_ENDPOINT`  
   The mirror site for huggingface.co. It is disabled by default. You can uncomment this line if you have limited access to the primary Hugging Face domain.
+- `MACOS`  
+  Optimizations for MacOS. It is disabled by default. You can uncomment this line if your OS is MacOS.
 
 ## 🐋 Service configuration