We have an existing Managed Package for which I'm setting up CI (continuous integration) with sfdx.
For packaging automation we will call
force:source:convert followed by
force:mdapi:deploy and ahead of this we'll need to authenticate with
To do so requires a Connected App configured for the JWT OAuth flow.
I have linked the package namespace using Namespace Registries in the DevHub and noticed that this results in a SalesforceDX Namespace Registry Connected App showing up in the packaging Org which I am able to install in the packaging Org in the usual way.
I inferred from this that this SalesforceDX Namespace Registry Connected App could be configured (with a self-signed-cert) and used for authentication during the CI process in any number of packaging Orgs.
However, I'm now unsure whether this is the case, since, having looked everywhere for specific documentation I can't find a mention of it.
Unfortunately I'm not a System Admin in the DevHub Org so I can't examine the existing configuration of the SalesforceDX Namespace Registry Connected App to gain any insights.