refactor: upgrade to rattler lock v7

[tdejager]

Currently in progress of updating to rattler_lock v7 that includes the variants.

Rattler changes currently live at:

conda/rattler#1775

Some notable changes:

• Using purls is slightly broken for source packages. This is currently not used but is something we should fix down the line.
• The python interpreter must be installed as a binary package atm.

Depends on

• fix: return all used variants pixi-build-backends#438
• feat: support changes for lockfile v7 pixi-build-testsuite#88

[baszalmstra]

To function properly, this requires: prefix-dev/pixi-build-backends#438. Without that PR not all used variants are returned which then causes an error during serialization of the lock-file. We are also currently still using the pixi-build-api-version 2 which makes it backwards compatible but introduces some inefficiencies. Im considering bumping the pixi-build-api-version, removing the inefficiencies and also ensuring that the backwards work properly with the above change in pixi-build-backends integrated.

WDYT @ruben-arts @tdejager ?

[tdejager]

To function properly, this requires: prefix-dev/pixi-build-backends#438. Without that PR not all used variants are returned which then causes an error during serialization of the lock-file. We are also currently still using the pixi-build-api-version 2 which makes it backwards compatible but introduces some inefficiencies. Im considering bumping the pixi-build-api-version, removing the inefficiencies and also ensuring that the backwards work properly with the above change in pixi-build-backends integrated.

WDYT @ruben-arts @tdejager ?

Yes!

[ruben-arts]

@baszalmstra Bumping the version makes sense!

[Hofer-Julian]

I've updated the PR with current main. We need to properly review and user test this and fix this bug before merging it: prefix-dev/pixi-build-testsuite#88 (comment)

On this branch this example shows the same problem:

pixi run test-slow lock_file::satisfiability::tests::test_example_satisfiability::manifest_path_16__UP__UP_examples_pixi_build_cpp_git_source_pixi_toml