Add python-flask-hello into downstream mirrors

Change-Id: I1b8edabbfd4df14318113c7c72f34eee2b45ba99
diff --git a/jenkins/client/job/git-mirrors/downstream/docker_images.yml b/jenkins/client/job/git-mirrors/downstream/docker_images.yml
index 2471280..ff1c649 100644
--- a/jenkins/client/job/git-mirrors/downstream/docker_images.yml
+++ b/jenkins/client/job/git-mirrors/downstream/docker_images.yml
@@ -6,4 +6,8 @@
       - name: docker-aptly
         downstream: mk/docker-aptly
         upstream: "https://github.com/tcpcloud/docker-aptly"
-        branches: master
\ No newline at end of file
+        branches: master
+      - name: python-flask-hello
+        downstream: mk/python-flask-hello
+        upstream: "https://github.com/tcpcloud/python-flask-hello"
+        branches: master