Docker image cache useage

[s4mur4i]

Is your feature request related to a problem? Please describe.
Megalinter images are quite big, and need to be pulled with multiple PR's in our github actions. We wanted to evaluate using pull through cache images to cache images locally, and then we don't need to go to internet to pull images, but actions doesn't allow using image overrides

Describe the solution you'd like
We could have an argument on actions, with the default value being the current image, but we could set it to point to pull through cache image

Describe alternatives you've considered
We tried evaluating setting a proxy to catch requests and proxy them, but we have multiple environments, and setting up every the proxies was to much, and we didn't feel like a good direction.