Read backend-url from Pulumi.yaml in login command

[ProdigySim]

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Issue details

Pulumi supports having backend defined in Pulumi.yaml.

backend:
  url: s3://my-backend

This is really great, since it ensures developers will log in to the correct backend for the project. However, this pulumi orb does not read from this configuration, so I have to duplicate this setting in my .circleci/config.yml.

It would be nice if pulumi/login could read from this value if no cloud-url is specified.

Affected area/feature

Login command