Use "image" instead of "container image"

[joelnitta]

Although it seems that the official docs do use container image, this term can be confusing for learners, who often struggle to understand the difference between containers and (container, ahem) images anyways. Furthermore, I have never encountered the term "container image" outside of the official docs or this lesson; everyone else uses "container" or "image". So learners may be confused by that as well when they read other resources about Docker.

[aturner-epcc]

When teaching, I comment explicitly on this point (and this is mentioned in the lesson). I also slip up when talking about "images" during teaching the lesson. I think that the written lesson should follow the official syntax "container image" but the trainer models real life by sometimes using "image" interchangeably.

[sstevens2]

We made the decision to move to the official language a couple years ago and switched the lesson to that. Maybe to address this issue we could add an instructor note so instructors can clarify the terms that work best for them when teaching? With the new workbench, we could do an inline comment when the container/image definitions come up. What do you both think?