Fix Code Quality CI config

Author: grega

.github/workflows/code_quality.yml

@@ -2,18 +2,13 @@ name: 'Code quality'
 on:
   workflow_call:
 
-defaults:
-  run:
-    working-directory: /app
-
 jobs:
   code_quality:
     runs-on: ubuntu-latest
     needs:
       - rubocop
     steps:
       - run: echo "All code quality checks complete."
-        working-directory: '/'
 
   rubocop:
     runs-on: ubuntu-latest