feat: First proposal of adding a flag to skip the platform check on pixi-unpack

[awesomebytes]

Motivation

Following this issue/conversation: #203

I went ahead and implement a first proposal on adding a flag that allows to skip the platform check in pixi unpack.

I realise this is probably not ideal naming, not ideal update to the validate_metadata_file function, and not ideal update to the docs. Happy to address comments and ideas in the PR :)

Thanks to anyone reading this!

Changes

• Added flag --allow-incompatible-target to skip the platform check when doing pixi unpack.
• Updated and added test.
• Updated docs.

If updating documentation:

• Updated documentation in https://github.com/prefix-dev/pixi/blob/main/docs/deployment/pixi_pack.md as well

[delsner]

Thanks for your contribution! I'm fine with this change, wdyt @pavelzw? @awesomebytes could you please run pixi run pre-commit-run to fix the pre-commit CI? Thanks!

[delsner]

Suggested change

	> You can only `pixi-unpack` a pack on a system that has the same platform as the pack was created for. However, this check can be
	skipped by using `--allow-incompatible-target`. This can be useful when using `pixi-unpack` to explore a different platform environment, or re-package it with other tools.
	> You can only `pixi-unpack` a pack on a system that has the same platform as the pack was created for. However, this check can be
	skipped by using `--allow-incompatible-target`. This can be useful when testing `pixi-unpack` on a platform different to the target platform, or re-package the environment with other tools.

[delsner]

Could you please add an integration test here that only runs on platform X, packages an environment for platform Y and unpacks it again on platform X using --allow-incompatible-target?