Allow a manual git connection

[brianjhanson]

It would be great if users could add a repository via an ssh URL directly without having to connect GitHub, BitBucket or GitLab.

[phillanier]

Note: OAuth connections to Bitbucket gives Craft Cloud full access to ALL repositories for that user.

Access Keys (Bitbucket) and Deploy Keys (Github) are a common way to give read-only access to one specific repo, e.g., for build pipelines like this.

[mjwsfg]

Second the request, it adds a further 3rd party solution and cost, and thus barrier to implementing CraftCMS Cloud for hosting. Our organization has standardized on Azure DevOps for our Git repo's. But really, any cloud accessible Git repo should be available given the agnostic nature of Git https/ssh connections.