Implement flags for targeting an execution environment during deployment

Connect 2025.04 allows setting environment.identifier in the bundle's manifest.json. This new field allows the content to target a specific execution environment when running on Connect. The existing environment.image field remains unchanged however the semantics are slightly different. An image selection is now treated the same as any other piece of matching criteria. Connect will choose any execution environment that uses the specified container image.

We should add an --environment-id flag to both deploy <app> and write-manifest <app> - the value is the guid of the target execution environment in Connect and it should be written to environment.identifier in the manifest.json.

We should also add arguments the following arguments to deploy <app>: --default-image and --default-environment-id. These arguments accepts an image name and an execution environment guid respectively, however instead of writing these to the manfiest.json, we should update the App record in Connect to set the app.default_image_name and app.default_environment_guid fields. This new workflow allows users to call deploy <app> --default-image='my/custom/image:latest' or deploy <app> --default-environment-id='<env-guid>' only once and the image/environment will continue to be used for subsequent deployments (as long as it isn't overwritten by another deployment). This means that the arguments doesn't need to be provided every time deploy <app> is called, which is how the current --image flag behaves. This is the same workflow used by the Connect dashboard.

Start with the command entry points for deploy and write-manifest , then inspect how the existing --image flag and environment fields are handled. Trace the Connect App update path for default_image_name and default_environment_guid. Done means the new flags write the requested manifest value or persist the App defaults as specified, with coverage for both commands and workflows.