Add webhook trigger

Jenkinsfile

@@ -7,6 +7,25 @@ pipeline {
         }
     }
 
+    triggers {
+        GenericTrigger(
+         genericVariables: [
+          [key: 'ref', value: '$.ref']
+         ],
+
+         causeString: 'Triggered on $ref',
+
+         printContributedVariables: true,
+         printPostContent: true,
+
+         silentResponse: false,
+         shouldNotFlatten: false,
+
+         regexpFilterText: '$ref',
+         regexpFilterExpression: 'refs/heads/' + BRANCH_NAME
+        )
+      }
+
     options {
         disableConcurrentBuilds()
         buildDiscarder(logRotator(numToKeepStr: '10', artifactNumToKeepStr: '10'))