feat: platform config passing through ImageExt trait

[mominul]

Alternative approach to #800 #837

I think this approach gives more flexibility API-wise. I am happy to add tests if the maintainers think this is a more suitable approach.

Fixes #500, #718

Thanks in advance!

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[DDtKey]

Hi @mominul 👋

Thanks for the contribution!

I think we may want to have both, but platform detection relying on default Docker's methods (DOCKER_DEFAULT_PLATFORM) looks like useful and needed feature.
As it's typical use-case for users and run the same code on different platforms (e.g developer with Apple Silicon, CI on linux + amd64 and etc)

Exposing a way to configure platform from the code looks reasonable as well, but it's more like addition, not a replacement of #800 & #837

What do you think about co-existence of both approaches? (with the following priory: explicitly configured in the code > auto-detection > fallback)

[mominul]

@DDtKey That would be great! I have rebased my changes upon #800 & #837 Can you have a look if you are okay with it? The CI failures are unrelated to these changes I think.

[DDtKey]

It looks good to me and provides enough of flexibility to users! 🚀

Thanks for the contribution!

@mervyn-mccreight WDYT?
It follows my suggestion above with the following priority:

• explicit config from code (this PR)
• auto-detected platform
• fallback to default