FIX: corrected command for starting gunicorn server

run.sh

@@ -6,7 +6,7 @@ set -e
 # run tests
 echo "--- RUNNING TESTS ---"
 pytest
-echo "--- TESTS PASSED, STARTING APPLICATION ---"
 
 # start gunicorn server, listening on port 7860
-CMD ["/bin/sh", "-c", "gunicorn --bind 0.0.0.0:7860 wsgi:app"]
+echo "--- TESTS PASSED, STARTING GUNICORN SERVER ---"
+exec gunicorn --bind 0.0.0.0:7860 wsgi:app