Add a Jenkinsfile to trigger the website build when something changes… (

#40)

* Add a Jenkinsfile to trigger the website build when something changes in docs

* No need for email alert in Jenkinsfile

Jenkinsfile

@@ -0,0 +1,50 @@
+/*
+ * 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.
+ */
+
+def AGENT_LABEL = env.AGENT_LABEL ?: 'ubuntu'
+
+pipeline {
+
+    agent {
+        label AGENT_LABEL
+    }
+
+    options {
+        buildDiscarder(
+            logRotator(artifactNumToKeepStr: '5', numToKeepStr: '10')
+        )
+        disableConcurrentBuilds()
+    }
+
+    stages {
+
+        stage('Website update') {
+            when {
+                branch 'master'
+                changeset 'docs/**/*'
+            }
+
+            steps {
+                build job: 'Camel/Camel.website/master', wait: false
+            }
+        }
+
+    }
+}
+