enable rapidsai-nightly channel for libraft (#3317)

Summary:
Pull Request resolved: #3317

libraft packages are first published in rapidsai-nightly and moved to rapidsai after release, at which point they're removed from rapidsai-nightly

In this diff we enable both channels with a preference to rapidsai (since it's before rapidsai-nightly on the command line).

Reviewed By: mlomeli1

Differential Revision: D55310143

fbshipit-source-id: b85e0fda86a442f435d985ace1d7eb37209c74e1

.circleci/config.yml

@@ -168,7 +168,7 @@ jobs:
                 command: |
                   cd conda
                   conda build faiss-gpu-raft --variants '{ "cudatoolkit": "<<parameters.cuda>>", "c_compiler_version": "<<parameters.compiler_version>>", "cxx_compiler_version": "<<parameters.compiler_version>>" }' \
-                      -c pytorch -c nvidia/label/cuda-<<parameters.cuda>> -c nvidia -c rapidsai -c conda-forge
+                      -c pytorch -c nvidia/label/cuda-<<parameters.cuda>> -c nvidia -c rapidsai -c rapidsai-nightly -c conda-forge
       - when:
           condition:
             and:
@@ -182,7 +182,7 @@ jobs:
                 command: |
                   cd conda
                   conda build faiss-gpu-raft --variants '{ "cudatoolkit": "<<parameters.cuda>>", "c_compiler_version": "<<parameters.compiler_version>>", "cxx_compiler_version": "<<parameters.compiler_version>>" }' \
-                      --user pytorch --label <<parameters.label>> -c pytorch -c nvidia/label/cuda-<<parameters.cuda>> -c nvidia -c rapidsai -c conda-forge
+                      --user pytorch --label <<parameters.label>> -c pytorch -c nvidia/label/cuda-<<parameters.cuda>> -c nvidia -c rapidsai -c rapidsai-nightly -c conda-forge
 
   build_cmake:
     parameters: