Improve Gitlab CI

- Only when PKGBUILD changes
- Remove debug messages

.gitlab-ci.yml

@@ -16,8 +16,6 @@ makepkg:
     - chmod 770 /root
   script:
     - ulimit -c 0
-    - pwd
-    - ls -Rl
     - sudo -u build -- makepkg --syncdeps
   artifacts:
     name: $CI_PROJECT_NAME-$CI_COMMIT_REF_NAME-$CI_COMMIT_SHA
@@ -43,4 +41,7 @@ commitpkg:
   script:
     - seblu-push
   only:
-  - master
+    refs:
+      - master
+    changes:
+      - PKGBUILD