Add initial Jenkinsfile

Jenkinsfile

@@ -0,0 +1,20 @@
+pipeline {
+  agent any
+  stages {
+    stage('bundle') {
+      steps {
+        sh 'bundle'
+      }
+    }
+    stage('rake test') {
+      steps {
+        sh 'bundle exec rake test'
+      }
+    }
+    stage('module:build') {
+      steps {
+        sh 'bundle exec rake module:build'
+      }
+    }
+  }
+}