Use strict priority in CI conda tests (#979)

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: #979

Author: bdice

ci/test_python.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-FileCopyrightText: Copyright (c) 2022-2023, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2022-2025, NVIDIA CORPORATION.
 # SPDX-License-Identifier: Apache-2.0
 
 # Common setup steps shared by Python test jobs
@@ -8,6 +8,9 @@ set -euo pipefail
 
 . /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"
 CPP_CHANNEL=$(rapids-download-conda-from-github cpp)
 PYTHON_CHANNEL=$(rapids-download-conda-from-github python)

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:
 - c-compiler

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:
 - c-compiler

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:
 - c-compiler

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:
 - c-compiler

dependencies.yaml

@@ -85,8 +85,8 @@ files:
     includes:
       - docs
 channels:
-  - rapidsai
   - rapidsai-nightly
+  - rapidsai
   - conda-forge
 dependencies:
   build: