Use strict priority in CI conda tests (rapidsai#211)

This PR sets conda to use `strict` priority in CI tests.

Mixing channel priority is frequently a cause of unexpected errors. Our CI jobs should always use strict priority in order to enforce that conda packages come from local channels with the artifacts built in CI, not mixing with older nightly artifacts from the `rapidsai-nightly` channel or other sources.

xref: rapidsai/build-planning#14

Authors:
  - Bradley Dice (https://github.com/bdice)

Approvers:
  - Gil Forsyth (https://github.com/gforsyth)

URL: rapidsai#211

Author: bdice

ci/test_python.sh

@@ -9,6 +9,9 @@ cd "$(dirname "$(realpath "${BASH_SOURCE[0]}")")"/../
 
 . /opt/conda/etc/profile.d/conda.sh
 
+rapids-logger "Configuring conda strict channel priority"
+conda config --set channel_priority strict
+
 rapids-logger "Downloading artifacts from previous jobs"
 PYTHON_CHANNEL=$(rapids-download-from-github "$(rapids-package-name "conda_python" nx-cugraph --pure)")
 

conda/environments/all_cuda-129_arch-aarch64.yaml

@@ -1,8 +1,8 @@
 # This file is generated by `rapids-dependency-file-generator`.
 # To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.
 channels:
-- rapidsai
 - rapidsai-nightly
+- rapidsai
 - conda-forge
 dependencies:
 - cuda-version=12.9

conda/environments/all_cuda-129_arch-x86_64.yaml

@@ -1,8 +1,8 @@
 # This file is generated by `rapids-dependency-file-generator`.
 # To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.
 channels:
-- rapidsai
 - rapidsai-nightly
+- rapidsai
 - conda-forge
 dependencies:
 - cuda-version=12.9

conda/environments/all_cuda-130_arch-aarch64.yaml

@@ -1,8 +1,8 @@
 # This file is generated by `rapids-dependency-file-generator`.
 # To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.
 channels:
-- rapidsai
 - rapidsai-nightly
+- rapidsai
 - conda-forge
 dependencies:
 - cuda-version=13.0

conda/environments/all_cuda-130_arch-x86_64.yaml

@@ -1,8 +1,8 @@
 # This file is generated by `rapids-dependency-file-generator`.
 # To make changes, edit ../../dependencies.yaml and run `rapids-dependency-file-generator`.
 channels:
-- rapidsai
 - rapidsai-nightly
+- rapidsai
 - conda-forge
 dependencies:
 - cuda-version=13.0

dependencies.yaml

@@ -67,8 +67,8 @@ files:
       - test_python_common
       - test_python_nx_cugraph
 channels:
-  - rapidsai
   - rapidsai-nightly
+  - rapidsai
   - conda-forge
 dependencies:
   checks: