workflows: take care of DCO job name

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

Author: AnnaShaleva

.github/workflows/dco.yml

@@ -6,4 +6,5 @@ on:
 
 jobs:
   dco:
+    name: Sign-off check
     uses: nspcc-dev/.github/.github/workflows/dco.yml@master