ENH Remove 'rapidsai-nightly' conda channel when building main branch (…

…#3825)

Remove `rapidsai-nightly` conda channel when building main branch

Authors:
  - Jordan Jacobelli (https://github.com/Ethyling)

Approvers:
  - AJ Schmidt (https://github.com/ajschmidt8)

URL: #3825

ci/cpu/build.sh

@@ -42,6 +42,11 @@ gpuci_logger "Activate conda env"
 . /opt/conda/etc/profile.d/conda.sh
 conda activate rapids
 
+# Remove rapidsai-nightly channel if we are building main branch
+if [ "$SOURCE_BRANCH" = "main" ]; then
+  conda config --system --remove channels rapidsai-nightly
+fi
+
 gpuci_logger "Check compiler versions"
 python --version
 $CC --version