configurable recipe location for pixi-build-rattler-build

[isuruf]

Problem description

This would make it easier to share a recipe.yaml file among different projects.

For eg: crusaderky/cpython#1

cc @lucascolley

[lucascolley]

this would be nice yes, although if we can select a build string for a git dependency then we should just be able to use a single pixi.toml next to the recipe, right?

[baszalmstra]

Is this not already possible with package.build.source?

[lucascolley]

https://prefix-dev.github.io/pixi-build-backends/backends/pixi-build-rattler-build/#usage suggests not?

[lucascolley]

I briefly tried package.build.source.path and indeed it seems to not work

[baszalmstra]

Can you explain what didnt work? It just didnt find the recipe.yaml.

[lucascolley]

[package.build]
source.path = "../default"

 INFO backend-metadata{manifest_source= platform=osx-arm64}: pixi_command_dispatcher::command_dispatcher::instantiate_backend: Instantiated backend pixi-build-rattler-build@0.3.5, negotiated API version 2
TRACE pixi_command_dispatcher::command_dispatcher_processor: Dispatch background task has finished
Error:   × could not initialize the build-backend
  ╰─▶   × Could not find a recipe.yaml in the source directory to use as the recipe
        │ manifest.