Fallback platforms feature #7080

Description

Many container images I uses are available for multiple platforms, most notably linux/amd64 and linux/arm64. On a current macbook any docker image pull will pull the linux/arm64 image - if that exists.

If that does not exist, pulling will fail with an error like:

no matching manifest for linux/arm64/v8 in the manifest list entries

I have enabled Rosetta on the macbook, will allows me to run linux/amd64 images. In almost all cases running a non-native linux/amd64 image is preferable over not being able to run the image at all.

So, if a normal image pull fails because there is not linux/arm64 image, then I will always have to manually add --platform linux/amd64 to the command.

It would be great if there was a optional/configurable list of fallback platforms that would be tried if the native platform isn't available.