Add docker package to readme

Author: mjarkk

README.md

@@ -40,11 +40,10 @@ mini-mail-dev
 **Docker**
 
 ```bash
-docker build -t mini-mail-dev https://github.com/mjarkk/mini-mail-dev.git#main
-docker run -it --rm -p 1080:1080 -p 1025:1025 mini-mail-dev
+docker run -it --rm -p 1080:1080 -p 1025:1025 ghcr.io/mjarkk/mini-mail-dev:latest
 ```
 
-**Git clone & Docker**
+**Docker build**
 
 ```bash
 git clone https://github.com/mjarkk/mini-mail-dev