Merge branch '2.0.x'

Author: wilkinsona

ci/tasks/promote.yml

@@ -5,6 +5,8 @@ image_resource:
   source:
     repository: springio/concourse-release-scripts
     tag: '0.3.4'
+    username: ((docker-hub-username))
+    password: ((docker-hub-password))
 inputs:
 - name: git-repo
 - name: artifactory-repo