Update the Jenkinsfile to blow everything out into parallel agents

This is likely going to crater, but let's try!

Jenkinsfile

@@ -1,5 +1,6 @@
 #!/usr/bin/env groovy
 
+def rubies = ['2.3.0', '2.3.1', '2.2.5', 'jruby', 'jruby-9.1.2.0', 'rubinius']
 
 node('docker') {
     checkout scm
@@ -7,10 +8,17 @@ node('docker') {
     stage 'Prepare base RVM container'
     sh './build-base.sh'
 
-    stage 'Build Containers for Rubies'
+    stage 'Push base RVM container'
-    sh './build-rubies.sh'
+    sh './push-base.sh'
 
-    stage 'Publish Containers'
+    stage 'Build Containers for Rubies'
+    def stepsForParallel = [:]
+    for (int i = 0; i < rubies.size(); i++) {
+        def ruby = rubies.get(i)
+        stepsForParallel[ruby] = {
+            node {
+                sh "./build-rubies.sh ${ruby}"
+                sh './pu
                 /* Using credentials with the ID 'dockerhub' from the Jenkins installation */
                 withCredentials([[$class: 'UsernamePasswordMultiBinding',
                                     credentialsId: 'dockerhub',
@@ -18,6 +26,11 @@ node('docker') {
                                 usernameVariable: 'DOCKERHUB_USERNAME']]) {
                     /* Our variables be exposed in the environment and we must log in before trying to publish to Dockerhub */
                     sh 'docker login --username=${DOCKERHUB_USERNAME} --email=tyler@monkeypox.org --password=${DOCKERHUB_TOKEN}'
-        sh './push-rubies.sh'
+                    sh "./push-rubies.sh ${ruby}"
                 }
             }
+        }
+    }
+    /* Fan everything out like crazy */
+    parallel(stepsForParallel)
+}

build-rubies.sh

@@ -6,6 +6,10 @@ source ./rubies
 
 mkdir -p work
 
+if [ -n $1 ]; then
+    RUBIES=( "${1}" )
+fi;
+
 for RUBY in "${RUBIES[@]}"; do
     DOCKERFILE="work/dockerfile-${RUBY}"
     cat > $DOCKERFILE <<EOF

push-base.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -x
+
+source ./rubies
+exec docker push ${IMAGE_TAG}:latest

push-rubies.sh

@@ -4,7 +4,9 @@ set -x
 
 source ./rubies
 
-docker push ${IMAGE_TAG}:latest
+if [ -n $1 ]; then
+    RUBIES=( "${1}" )
+fi;
 
 for RUBY in "${RUBIES[@]}"; do
     echo "> Pushing ${IMAGE_TAG}:${RUBY}"

rubies

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
 
-export RUBIES=( 2.3.0 jruby jruby-9.1.2.0 ruby-head)
+export RUBIES=( 2.3.0 2.3.1 2.2.5 jruby jruby-9.1.2.0 ruby-head)
 
 export IMAGE_TAG="rtyler/rvm"