gitlab-ci: enable python black check in gitlab-ci

.gitlab-ci.yml

@@ -77,8 +77,9 @@ checkpatch:
   image: fedora:32
   stage: test
   script:
-    - date '+%Y%m%d-%H%M%S'; dnf install -y git
+    - date '+%Y%m%d-%H%M%S'; dnf install -y git black
     - date '+%Y%m%d-%H%M%S'; NM_CHECKPATCH_FETCH_UPSTREAM=1 contrib/scripts/checkpatch-feature-branch.sh 2>&1 | tee checkpatch-out.txt
+    - date '+%Y%m%d-%H%M%S'; black --check .
   allow_failure: true
   artifacts:
     when: on_failure