Client credentials flow support for "sf org login jwt"

[adambestsf]

Is your feature request related to a problem? Please describe.
To simplify CICD successfully logging into 100s of sandboxes or production, 1 less parameter to pass into the sf org login jwt command is always a win

What are you trying to do
Login to a SF Sandbox or production using "sf org login jwt" with Client Credentials flow. This does not require the a username. https://developer.salesforce.com/blogs/2023/03/using-the-client-credentials-flow-for-easier-api-authentication

Client credentials flow assumes running user set on connected app so you shouldn't have to pass a username into the sf command.

Describe the solution you'd like
I would like the flag "username" not mandatory on the sf org login jwt. This "should" allow a successful login with a connected app which has client credentials flow configured correctly. 1) client credentials flow ticked 2) Client Credentials Flow user completed

Describe alternatives you've considered
Continue to pass the flag "username" when connecting to a sandbox or production.

Additional context
Sample Error being received: Missing required flag username

sf org login jwt --jwt-key-file ...server.key --client-id xxxx --alias serviceqa --set-default --instance-url https://xxx.sandbox.my.salesforce.com/
Error (1): The following error occurred:
Missing required flag username
See more help with --help

[github-actions[bot]]

Thank you for filing this feature request. We appreciate your feedback and will review the feature at our next grooming or sprint planning session. We prioritize feature requests with more upvotes and comments.

[git2gus[bot]]

This issue has been linked to a new work item: W-13100738

[marsson]

AWESOME suggestion...maybe this would fall out of the JWT command, but a specific client logibn command would be of great value!!