[damned-lies] fix: do not run CI/CD on PO files changes

[Guillaume Bernard <gbernard src gnome org>]

commit be1fe912a67c9d73a34fc4b53dbe3461accb7acd
Author: Guillaume Bernard <associations guillaume-bernard fr>
Date:   Thu Sep 22 09:54:49 2022 +0200

    fix: do not run CI/CD on PO files changes
    
    Fixes #313

 .gitlab-ci.yml | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 55b86fd5..a1160269 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -17,6 +17,10 @@ workflow:
     # A push event on a merge request should not be triggered to avoid duplicate pipelines
     - if: '$CI_PIPELINE_SOURCE == "push" && $CI_MERGE_REQUEST_ID != null'
       when: never
+    # Never run on .po file changes (likely to be committed by Damned Lies itself)
+    - changes:
+        - po/*
+      when: never
     - when: always