pkg(groovy-3.0.7): add compile step

packages/groovy/3.0.7/compile

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# Compile groovy scripts into a separate "classes" directory
+# NOTE: - Main file MUST be a groovy script 
+#       - not supporting object class entry points as of now
+groovyc -d classes "$@"
+
+# Create the Manifest and include groovy jars:
+# NOTE: - main class will be the first file ('.' becomes '_' and without the extension)
+#       - groovy lib jars MUST be in the class path in order to work properly
+echo "Main-Class: $(sed 's/\./\_/g'<<<${1%.*})
+Class-Path:  $(echo $GROOVY_HOME/lib/*.jar | sed 's/\s/\n  /g')
+
+" > manifest.txt
+
+# Create the jar from the manifest and classes
+jar cfm out.jar manifest.txt -C classes .