Remove triggers from docker-publish-github jobs

Change-Id: Ia767c4e4791561f104301a51f8098e895794d92c
diff --git a/jjb/docker-publish-github.yaml b/jjb/docker-publish-github.yaml
index 6df76ec..0551bac 100644
--- a/jjb/docker-publish-github.yaml
+++ b/jjb/docker-publish-github.yaml
@@ -15,10 +15,6 @@
           url: 'https://github.com/{github-organization}/{project}'
           display-status: 'docker-publish'
 
-    triggers:
-      - cord-infra-github-pr-trigger-merge:
-          project: '{project}'
-
     wrappers:
       - lf-infra-wrappers:
           build-timeout: '{build-timeout}'