message: Remove logs before running end-to-end tests
  Hopefully will stop the end-to-end tests failing when buildkite
  re-uses an agent.
diff: @@ -36,7 +36,7 @@ echo "--- Install synapse & other dependencies"
  ./install.sh
  # install static webserver to server symlinked local copy of riot
  ./riot/install-webserver.sh
  -mkdir logs
  +mkdir logs || rm -r logs/*
  echo "+++ Running end-to-end tests"
  TESTS_STARTED=1
  ./run.sh --no-sandbox --log-directory logs/
  