public Builder includeSourceFiles(boolean includeSourceFiles) {
            this.includeSourceFiles = includeSourceFiles;
            return this;
        }
Builder for {@link com.yahoo.config.model.application.provider.FilesApplicationPackage}. Use
this to create instances in a flexible manner.
config-application-package/src/main/java/com/yahoo/config/model/application/provider/FilesApplicationPackage.java