Update README.md

Added instructions for building and running for a specific hostname

README.md

@@ -2,20 +2,26 @@
 
 Easy markdown-based wiki written in Go language and React with the usage of TOAST UI Editor for the great markdown WYSIWIG editing
 
-## Build and run
+## Build and run on localhost
 
 ```bash
 docker build -t ewi .
 docker run  --memory="500m" --restart=always --name ewi -v ewi-repo:/var/lib/ewi-server/repo -d -p 8088:80 -p 8888:8888 ewi -build=`git rev-parse HEAD` 
 ```
 
-
-## Run
+## Run on localhost without build
 
 ```bash
 docker run  --memory="500m" --restart=always --name ewi -v ewi-repo:/var/lib/ewi-server/repo -d -p 8088:80 -p 8888:8888 derbylock/ewi:latest -build=`git rev-parse HEAD`
 ```
 
+## Build and run for a specific hostname
+
+```bash
+docker build --build-arg EWI_SERVER_PATH="http://hostname:8888/" -t ewi .
+docker run  --memory="500m" --restart=always --name ewi -v ewi-repo:/var/lib/ewi-server/repo -d -p 8088:80 -p 8888:8888 ewi -build=`git rev-parse HEAD` 
+```
+
 ## Usage
 
 Open in browser http://localhost:8088/