v1 recipe and channel_sources and priority

[bollwyvl]

Solution to issue cannot be found in the documentation.

• I checked the documentation.

Issue

It appears channel_sources aren't taken into account during rattler-build:

conda-forge/jupyterlite-core-feedstock#46

# recipe/conda_build_config.yaml
channel_sources:
  - conda-forge/label/jupyterlab_alpha,conda-forge/label/notebook_alpha,conda-forge

channel_targets:
  - conda-forge jupyterlite_core_alpha

# conda-forge.yml
channel_priority: disabled  # probably not needed, but...

Yields:

 ╭─ Running python test(s)
 │
 │ ╭─ Testing with default python version
 │ │ 
 │ │ Resolving test environment:
 │ │   Platform: linux-64 [__unix=0=0, __linux=6.5.0=0, __glibc=2.34=0, __archspec=1=x86_64_v4]
 │ │   Channels: 
 │ │    - file:///tmp/.tmpsQV5ka/
 │ │    - file:///home/conda/feedstock_root/build_artifacts/
 │ │    - conda-forge
 │ │   Specs:
 │ │    - jupyterlite-core-with-lab ==0.6.0a0 hd5b2252_0
 │ │    - pip
 │ │
 │ ╰─────────────────── (took 0 seconds)
 │
 ╰─────────────────── (took 0 seconds)
Error: 
  × failed to setup test environment: Cannot solve the request because of:
  │ jupyterlite-core-with-lab ==0.6.0a0 hd5b2252_0 cannot be installed because
  │ there are no viable options:
  │ └─ jupyterlite-core-with-lab 0.6.0a0 would require
  │    └─ jupyterlab >=4.4.0a2,<4.5, for which no candidates were found.
  │ The following packages are incompatible
  │ └─ jupyterlite-core-with-lab ==0.6.0a0 hd5b2252_0 cannot be installed
  │ because there are no viable options:
  │    └─ jupyterlite-core-with-lab 0.6.0a0 is excluded because due to strict
  │ channel priority not using this option from: 'file:///home/conda/
  │ feedstock_root/build_artifacts/'
  │ 
  ╰─▶ Cannot solve the request because of: jupyterlite-core-with-lab ==0.6.0a0
      hd5b2252_0 cannot be installed because there are no viable options:
      └─ jupyterlite-core-with-lab 0.6.0a0 would require
         └─ jupyterlab >=4.4.0a2,<4.5, for which no candidates were found.
      The following packages are incompatible
      └─ jupyterlite-core-with-lab ==0.6.0a0 hd5b2252_0 cannot be installed
      because there are no viable options:
         └─ jupyterlite-core-with-lab 0.6.0a0 is excluded because due to
      strict channel priority not using this option from: 'file:///home/conda/
      feedstock_root/build_artifacts/'

Installed packages

azure

Environment info

azure