read_files() fails but only on CI; try adding explicit creation on tmp/../sandbox dir
read_files() fails but only on CI; try adding explicit creation on tmp/../sandbox dir

cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner_stateless,cyber-dojo/runner,cyber-dojo/runner_stateless,cyber-dojo/runner