[Draft] [flytekit] Polish - Container ux

[wild-endeavor]

Container UX

This is a series of tickets to improve the flytekit authoring experience. If any changes are not possible to make in a backwards-compatible way, split it out into a separate ticket.

Argument name

Rename the argument container_image to image in task (and any other relevant decorators, such as dynamic, and eager). container_image is too verbose and the concept of a “container” should be abstracted away from the user.

Image Spec

Rename ImageSpec to just Image. The idea of a Spec should be abstracted away from the users. In their minds, they are just building an image. With union image builder, they don't even need a docker runtime installed.

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes