Drop explicit host ports Compose will automatically allocate unassigned ports. These can be looked up e.g. using `docker compose port'. Enables using several "instances" of the application with different project names (`docker compose -p <project name>').

<Context>
    <!-- Override context parameters in web.xml of gwt-client deployment here.
         E.g. uncomment the following to use SSO via GGinA: -->
    <!-- <Parameter name="authentication" value="ggina" override="false"/> -->
</Context>