[discourse-web] Switch to the tests-passed branch

[Andrea Veri <averi src gnome org>]

commit 764586ed13894ed1794430c1b89ce600a301ed07
Author: Andrea Veri <averi redhat com>
Date:   Fri Mar 1 13:04:03 2019 +0100

    Switch to the tests-passed branch

 Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/Dockerfile b/Dockerfile
index 5b38bfd..50fa036 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,7 +29,7 @@ RUN apt update && \
 
 ### Set up Discourse ##################################
 #   - So we can overrride it with --build_arg
-ARG DISCOURSE_VERS='stable'
+ARG DISCOURSE_VERS='tests-passed'
 ENV DISCOURSE_RELEASE=$DISCOURSE_VERS RAILS_ENV=production RAILS_ROOT=/discourse HOME=/discourse
 
 RUN mkdir -p discourse && \