allow running Github Actions on 'maintenance/**' branches. (#267)

Co-authored-by: Lukas Spalek <spalek@epages.com>

Author: lspalek

.github/workflows/test.yml

@@ -3,6 +3,7 @@ on:
   push:
     branches:
       - master
+      - 'maintenance/**'
   pull_request:
     types: [opened, synchronize, reopened]