Explicitly add "build" profile to "Build clean" stage

Change-Id: Ie36abb1c133ab726a53c5882b0665895323c81eb
Signed-off-by: Frederic Gurr <frederic.gurr@eclipse-foundation.org>

Jenkinsfile

diff --git a/Jenkinsfile b/Jenkinsfile
index fb149c3..b49f760 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -31,7 +31,7 @@
         }
         stage('Build clean') {
             steps {
-                sh 'mvn clean verify -Pbuilt-at-eclipse.org'
+                sh 'mvn clean verify -Pbuilt-at-eclipse.org -Pbuild' 
             }
         }
         stage('Deploy to staging') {