test(ci): build against vyasr/raft#3019 (detail symbol visibility fix)

Temporarily points cuvs at vyasr/raft@fix/detail_symbol_export so CI
exercises the fix that removes RAFT_EXPORT from detail namespace
declarations in raft headers.

Changes:
- cpp/cmake/thirdparty/get_raft.cmake: RAFT_FORK=vyasr,
  RAFT_PINNED_TAG=fix/detail_symbol_export
- ci/use_conda_packages_from_prs.sh: downloads libraft conda artifacts
  from NVIDIA/raft#3019 via rapids-get-pr-artifact
- ci/use_wheels_from_prs.sh: downloads libraft wheel artifacts from
  NVIDIA/raft#3019
- All conda CI scripts (build_cpp, build_python, build_docs, build_go,
  build_java, build_rust, test_cpp, test_python): source
  use_conda_packages_from_prs.sh after conda strict channel priority
- build_wheel_libcuvs.sh: source use_wheels_from_prs.sh after
  rapids-init-pip

Revert these changes once NVIDIA/raft#3019 is merged and picked up
by the nightly.

Author: vyasr

ci/build_cpp.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-FileCopyrightText: Copyright (c) 2022-2025, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2022-2026, NVIDIA CORPORATION.
 # SPDX-License-Identifier: Apache-2.0
 
 set -euo pipefail
@@ -22,8 +22,9 @@ RAPIDS_ARTIFACTS_DIR=${RAPIDS_ARTIFACTS_DIR:-"${PWD}/artifacts"}
 mkdir -p "${RAPIDS_ARTIFACTS_DIR}"
 export RAPIDS_ARTIFACTS_DIR
 
+source ./ci/use_conda_packages_from_prs.sh
+
 # populates `RATTLER_CHANNELS` array and `RATTLER_ARGS` array
-source rapids-rattler-channel-string
 
 # --no-build-id allows for caching with `sccache`
 # more info is available at

ci/build_docs.sh

@@ -14,6 +14,8 @@ rapids-logger "Create test conda environment"
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
+
 RAPIDS_VERSION_MAJOR_MINOR="$(rapids-version-major-minor)"
 export RAPIDS_VERSION_MAJOR_MINOR
 

ci/build_go.sh

@@ -13,6 +13,8 @@ rapids-logger "Create test conda environment"
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
+
 rapids-dependency-file-generator \
   --output conda \
   --file-key go \

ci/build_java.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# SPDX-FileCopyrightText: Copyright (c) 2025, NVIDIA CORPORATION.
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION.
 # SPDX-License-Identifier: Apache-2.0
 
 set -euo pipefail
@@ -25,6 +25,8 @@ fi
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
+
 rapids-logger "Downloading artifacts from previous jobs"
 CPP_CHANNEL=$(rapids-download-conda-from-github cpp)
 

ci/build_python.sh

@@ -19,8 +19,9 @@ version=$(rapids-generate-version)
 export RAPIDS_PACKAGE_VERSION=${version}
 echo "${version}" > VERSION
 
+source ./ci/use_conda_packages_from_prs.sh
+
 # populates `RATTLER_CHANNELS` array and `RATTLER_ARGS` array
-source rapids-rattler-channel-string
 
 rapids-logger "Prepending channel ${CPP_CHANNEL} to RATTLER_CHANNELS"
 

ci/build_rust.sh

@@ -13,6 +13,8 @@ rapids-logger "Create test conda environment"
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
+
 rapids-dependency-file-generator \
   --output conda \
   --file-key rust \

ci/build_wheel_libcuvs.sh

@@ -6,6 +6,8 @@ set -euo pipefail
 
 source rapids-init-pip
 
+source ./ci/use_wheels_from_prs.sh
+
 package_name="libcuvs"
 package_dir="python/libcuvs"
 

ci/test_cpp.sh

@@ -9,6 +9,8 @@ set -euo pipefail
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
+
 CPP_CHANNEL=$(rapids-download-conda-from-github cpp)
 
 rapids-logger "Generate C++ testing dependencies"

ci/test_python.sh

@@ -9,6 +9,8 @@ set -euo pipefail
 rapids-logger "Configuring conda strict channel priority"
 conda config --set channel_priority strict
 
+source ./ci/use_conda_packages_from_prs.sh
+
 rapids-logger "Downloading artifacts from previous jobs"
 CPP_CHANNEL=$(rapids-download-conda-from-github cpp)
 PYTHON_CHANNEL=$(rapids-download-from-github "$(rapids-package-name "conda_python" cuvs --stable --cuda "$RAPIDS_CUDA_VERSION")")

ci/use_conda_packages_from_prs.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+# SPDX-FileCopyrightText: Copyright (c) 2025-2026, NVIDIA CORPORATION.
+# SPDX-License-Identifier: Apache-2.0
+
+# Temporary: download libraft conda artifacts from rapidsai/raft#3019
+# (fix/detail_symbol_export — removes RAFT_EXPORT from detail namespaces)
+# Remove this file and all `source ./ci/use_conda_packages_from_prs.sh` calls
+# once that PR is merged and the nightly picks it up.
+
+LIBRAFT_CHANNEL=$(rapids-get-pr-artifact raft 3019 cpp conda)
+
+# For rattler builds: prepend to RAPIDS_PREPENDED_CONDA_CHANNELS so that
+# rapids-rattler-channel-string picks them up with strict channel priority.
+RAPIDS_PREPENDED_CONDA_CHANNELS=(
+    "${LIBRAFT_CHANNEL}"
+)
+export RAPIDS_PREPENDED_CONDA_CHANNELS
+
+# For mamba/conda installs: prepend to the system-wide channel list.
+for _channel in "${RAPIDS_PREPENDED_CONDA_CHANNELS[@]}"; do
+    conda config --system --add channels "${_channel}"
+done