Java env builder with Maven (#783)

Java environment builder with support for Maven builds. Default build comman runs `mvn clean package` and picks up target/*with-dependencies.jar for function.

environments/jvm/builder/build.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+set -eou pipefail
+mvn clean package
+cp ${SRC_PKG}/target/*with-dependencies.jar ${DEPLOY_PKG}