Add a simple-ish Jenkinsfile for building on JDK8 in parallel on Jenkins

Author: R. Tyler Croy

Jenkinsfile

@@ -0,0 +1,27 @@
+#!/usr/bin/env groovy
+
+node {
+    stage 'Checkout source'
+    checkout scm
+
+    stage 'Build and test'
+    List<String> plugins = ['base', 'war', 'jar']
+    Map parallelSteps = [:]
+
+    for (int i = 0; i < plugins.size(); i++) {
+        def plugin = "jruby-gradle-${plugins.get(i)}-plugin"
+        parallelSteps[plugin] = {
+            node('docker') {
+                checkout scm
+                docker.image('java:8-jdk').inside {
+                    timeout(30) {
+                        sh "./gradlew -Si ${plugin}:check ${plugin}:gradleTest ${plugin}:assemble"
+                    }
+                }
+                junit 'build/test-results/**/*.xml'
+                archiveArtifacts artifacts: 'build/libs/*.jar,build/*.zip', fingerprint: true
+            }
+        }
+    }
+    parallel(parallelSteps)
+}