Implement flags for targeting an execution environment during deployment

Comece pelos pontos de entrada dos comandos deploy e write-manifest e, em seguida, inspecione como a flag existente --image e os campos de ambiente são tratados. Rastreie o caminho de atualização do Connect App para default_image_name e default_environment_guid. Considera-se concluído quando as novas flags gravarem o valor solicitado no manifesto ou persistirem os padrões do App conforme especificado, com cobertura para ambos os comandos e workflows.

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.