[PATCH] gitlab-ci: Be ready for new default 'main' branch name

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

In order to be ready for the GitLab changes in using inclusive
terminology (replacing the 'master' branch name by the 'main'
branch name), rename our use of 'master' by the $CI_DEFAULT_BRANCH
environment variable, so new forks won't be facing any issue.

References:

- https://sfconservancy.org/news/2020/jun/23/gitbranchname/
- https://about.gitlab.com/blog/2021/03/10/new-git-default-branch-name/

Suggested-by: Savitoj Singh <savsingh@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index f718b61fa78..db4e8490483 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -784,7 +784,7 @@ check-patch:
   script: .gitlab-ci.d/check-patch.py
   except:
     variables:
-      - $CI_PROJECT_NAMESPACE == 'qemu-project' && $CI_COMMIT_BRANCH == 'master'
+      - $CI_PROJECT_NAMESPACE == 'qemu-project' && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   variables:
     GIT_DEPTH: 1000
   allow_failure: true
@@ -797,7 +797,7 @@ check-dco:
   script: .gitlab-ci.d/check-dco.py
   except:
     variables:
-      - $CI_PROJECT_NAMESPACE == 'qemu-project' && $CI_COMMIT_BRANCH == 'master'
+      - $CI_PROJECT_NAMESPACE == 'qemu-project' && $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   variables:
     GIT_DEPTH: 1000
 
-- 
2.26.3