Added support for jenkins official container

jenkins/Jenkinsfile

@@ -0,0 +1,38 @@
+#!/usr/bin/env groovy
+
+properties([
+    buildDiscarder(logRotator(numToKeepStr: '5', artifactNumToKeepStr: '5')),
+    pipelineTriggers([cron('@daily')]),
+])
+
+node('docker') {
+    deleteDir()
+
+    stage('Checkout') {
+        checkout scm
+    }
+
+    if (!infra.isTrusted()) {
+        /* Outside of the trusted.ci environment, we're building and testing
+         * the Dockerful in this repository, but not publishing to docker hub
+         */
+        stage('Build') {
+            docker.build('jenkins')
+        }
+
+        stage('Test') {
+            sh """
+            git submodule update --init --recursive
+            git clone https://github.com/sstephenson/bats.git
+            bats/bin/bats tests
+            """
+        }
+    } else {
+        /* In our trusted.ci environment we only want to be publishing our
+         * containers from artifacts
+         */
+        stage('Publish') {
+            sh './publish.sh'
+        }
+    }
+}