Add blueocean plugin

Change-Id: Iacb5dc34f20a2c6aa76566bb6922bc21afa73ae8
diff --git a/Dockerfile b/Dockerfile
index 4237ab7..d56982f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -76,6 +76,7 @@
 
 RUN JENKINS_UC_DOWNLOAD=http://archives.jenkins-ci.org /usr/local/bin/install-plugins.sh \
         artifactory \
+        blueocean \
         build-blocker-plugin \
         build-monitor-plugin \
         build-timeout \