forgetting to pass --config argument causes strange error

[aereal]

Way to reproduce

Run ecspresso init with required arguments except --config.

Expected behavior

No errors happen or enough information to fix it such as --config required but not passed.

Actual Behavior

Got failed to write file: open : no such file or directory error.

Full error messages are below:

[2021-07-21 13:55:58] ✘╹◡╹✘ < ecspresso init --cluster $cluster_arn --service $service_arn
2021/07/21 13:56:06 <snip> save service definition to ecs-service-def.json
2021/07/21 13:56:06 <snip> save task definition to ecs-task-def.json
2021/07/21 13:56:06 <snip> save config to
2021/07/21 13:56:06 init FAILED. failed to write file: open : no such file or directory

Way to fix

I think --config argument is actually a required parameter so it must be marked as a required parameter using .Required(), or should we set a default value such as config.yml?

[aereal]

Fixed by #308