Run "gradlew build" to generate and test all published JAR artifacts
Run "gradlew build" to generate and test all published JAR artifacts

Prior to this commit only "gradlew check" was performed. That didn't
generate JARs for at least the following sub-projects:

 * junit-jupiter-migration-support
 * junit-platform-gradle-plugin
 * junit-platform-surefire-provider

junit-team/junit-lambda,sbrannen/junit-lambda