[pango/limit-macos-ci] ci: Limit MacOS ci builds

[Matthias Clasen <matthiasc src gnome org>]

commit d7cc7d2a6e63b6e3c1e41ffb70937b095fe7db8d
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 3 19:53:49 2021 -0500

    ci: Limit MacOS ci builds
    
    We are building the whole stack every time,
    so limit this to just master and merge requests.

 .gitlab-ci.yml | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ff36ec71..a519504a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -82,6 +82,9 @@ macos:
   stage: build
   tags:
     - macos
+  only:
+    - master
+    - merge_requests
   needs: []
   before_script:
     - pip3 install --user meson==0.56