drop docker exec, use docker compose exec with service name

.github/workflows/github-actions-demo.yml

@@ -47,7 +47,9 @@ jobs:
  pytest -sv
  
  # flush all data from cache
- docker exec -it redis-local sh -c "redis-cli FLUSHALL"
+ cd movie_service/
+ docker compose exec redis-local sh -c "redis-cli FLUSHALL"
+ cd ../
  
  # test coverage
  coverage run -m pytest