Use Circle CI's org context (#5561)

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

.circleci/config.yml

@@ -126,6 +126,7 @@ workflows:
           tags:
             only: /.*/
     - docker_hub_master:
+        context: org-context
         requires:
         - test
         - build
@@ -133,6 +134,7 @@ workflows:
           branches:
             only: master
     - docker_hub_release_tags:
+        context: org-context
         requires:
         - test
         - build
@@ -150,5 +152,5 @@ workflows:
               only:
                 - master
     jobs:
-      - makefile_sync
-    
+    - makefile_sync:
+        context: org-context