chore(github-action): polish on-commits

We avoid displaying the same information multiple times

.github/workflows/on-commits.yml

@@ -73,7 +73,7 @@ jobs:
           
           git add config/blobs.yml
           git status
-          if git commit -a --dry-run;then 
+          if git commit -a --dry-run 2>&1 >/dev/null;then 
             git commit -a -m "updating blobs" && \
               git push ${remote_repo} HEAD:master
           else