Add note about build starting in Jenkinsfile

Change-Id: Ibabc64507bafc3fbac132cb59630e253c500134e
Signed-off-by: Mickael Istria <mistria@redhat.com>
diff --git a/Jenkinsfile b/Jenkinsfile
index 0119552..1e10d07 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -13,7 +13,7 @@
 	stages {
 		stage('initialize Gerrit review') {
 			steps {
-				gerritReview labels: [Verified: 0]
+				gerritReview labels: [Verified: 0], message: "Build started $BUILD_URL"
 			}
 		}
 		stage('Build') {