At the moment we do have a hard dependency of Keycloak's AS7 Adapter (see jboss-web.xml in the 'server' module)

I think we can use the assembly to generate different WAR files of the 'server module', with different values for https://github.com/aerogear/aerogear-unifiedpush-server/blob/master/server/src/main/webapp/WEB-INF/jboss-web.xml#L1-L5