update docs about docker

docker/README.md

@@ -4,12 +4,20 @@ If you prefer to run linux in a container, you can use below command to build an
 
 ### Build
 ```Shell
-docker build -t eaf -f Dockerfile.arch .
+docker build -t eaf  .
 ```
 
 ### Run
 ```Shell
 xhost +local:root # WARN: this comes with security issues
 
-docker run -e DISPLAY -e DBUS_SESSION_BUS_ADDRESS --rm -it -v /tmp/.X11-unix/:/tmp/.X11-unix -v /run/user/$(id -u)/:/run/user/1000/ -v ~/.Xauthority:/home/eaf/.Xauthority   eaf
+docker run -e DISPLAY -e DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus --rm -it -v /tmp/.X11-unix/:/tmp/.X11-unix -v /run/user/$(id -u)/:/run/user/1000/ -v ~/.Xauthority:/home/eaf/.Xauthority   eaf
+```
+You can also reuse your own Emacs configuration in the container:
+
+```Shell
+xhost +local:root # WARN: this comes with security issues
+
+# mount the Emacs configuration into the container
+docker run -e DISPLAY -e DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus --rm -it -v /tmp/.X11-unix/:/tmp/.X11-unix -v /run/user/$(id -u)/:/run/user/1000/ -v ~/.Xauthority:/home/eaf/.Xauthority -v ~/.emacs.d:/home/eaf/.emacs.d  eaf
 ```