Liberty container image includes scripts (configure.sh, startup) that generate the default keystore. It's added to /config/configDropins/defaults. Provide a build arg/env to skip the generation of the default keystore

Relevant issue: WASdev/ci.docker#493 (comment)

Also, consider providing an option to skip the generation of the default truststore. The default truststore.xml is written to configDropons/overrides, not sure what the historical reason is. This would override the user-specified truststore config in server.xml as well.