Jenkins: Add Jenkinsfile

JIRA: MADLIB-1466

We now have a multi branch pipeline job on apache cloudbees jenkins
instance. This project needs a Jenkinsfile which defines all the stages and
steps of the pipeline.

We currently run the following
1. rat check tests
2. compile madlib
3. Run dev-check and unit tests

Co-authored-by: Ekta Khanna<ekhanna@vmware.com>
diff --git a/Jenkinsfile b/Jenkinsfile
new file mode 100644
index 0000000..1cdcbb7
--- /dev/null
+++ b/Jenkinsfile
@@ -0,0 +1,44 @@
+/*
+ *
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+
+pipeline {
+        agent {
+                node {
+                    label 'ubuntu'
+                }
+        }
+        tools {
+            maven 'maven_latest'
+        }
+        stages {
+                stage('Ratcheck') {
+                        steps {
+                              echo 'Running rat check tests'
+                              sh "mvn apache-rat:check"
+                              sh './tool/jenkins/rat_check.sh'
+                        }
+                }
+                stage('Build and Test') {
+                        steps {
+                                echo 'Building src and running dev-check and unit tests'
+                                sh './tool/jenkins/jenkins_build.sh'
+                        }
+                }
+        }
+}
diff --git a/tool/jenkins/rat_check.sh b/tool/jenkins/rat_check.sh
old mode 100644
new mode 100755
index 32b4a8d..0042bee
--- a/tool/jenkins/rat_check.sh
+++ b/tool/jenkins/rat_check.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 # ----------------------------------------------------------------------
 # Licensed to the Apache Software Foundation (ASF) under one
 # or more contributor license agreements.  See the NOTICE file