[4.9] add example that exposes the default ports to the host.

4-development/4.9-dev-environment.md

@@ -19,8 +19,11 @@ The launch scripts assume that those two repositories reside in the same directo
 Steps to get a running setup:
 
 1. Mount the current directory containing the integritee-worker and integritee node into the Docker container and start a bash session inside: 
-```
+```shell
 docker run -it --mount "type=bind,src=$(pwd),dst=/opt/shared" --workdir /opt/shared integritee/integritee-dev:0.1.10 /bin/bash
+
+# If you want to expose the default ports of the services we are gong to launch to the host you can supply some `-p` args:
+docker run -it --mount "type=bind,src=$(pwd),dst=/opt/shared" --workdir /opt/shared -p 9944:9944 -p 2000:2000 -p 3443:3443 integritee/integritee-dev:0.1.10 /bin/bash
 ```
 2. Now you have access to the shell in the Docker container. So you can start the builds.
 ```shell