[error] The file "manifest.yml" does not exist

Problem/Motivation

I run lando drush migrate-manifest --legacy-db-url=mysql://drupal7:drupal7@localhost/drupal7 manifest.yml and get the following error:
[error] The file "manifest.yml" does not exist
Even if I create the manifest.yml file in the current directory, I get the error and it doesn't get populated.

Steps to reproduce

1. Install module
2. Navigate to the config directory
3. run above command
4. No file created

Proposed resolution

I'm not sure how to solve the missing file issue, but it seems you should be able to pass a port to the legacy-db-url.