refactor stages that have to download docker images

[wind57]

No description provided.

[wind57]

here is what we currently do in simple words:

• build docker images that we need (1)
• save into a cache (2)
• in testing steps download docker images from the cache (3)

Why do we do it likes this?
No real reason, historically this is how it used to be done when we had circleci. circleci, unlike github actions, had some features that would make this choice a very good one. As we see, github actions keeps on failing for us.

So why not delete these steps (2) and (3) and move (1) into the testing steps? That is entirely doable, but doesn't that mean that we will increase the build times?

Well, no. Since we run tests in parallel, the time is going to stay the same, and this is what we see also: the times are almost the same with this change and without it.

[ryanjbaxter]

That makes sense :)