[backport] [CI] Upload libxgboost4j.dylib (M1) to S3 bucket (#9887)

* [CI] Set up CI for Mac M1 (#9699)

* [CI] Improve CI for Mac M1 (#9748)

* [CI] Build libxgboost4j.dylib with CMAKE_OSX_DEPLOYMENT_TARGET (#9749)

* [CI] Upload libxgboost4j.dylib (M1) to S3 bucket (#9886)

tests/buildkite/pipeline-mac-m1.yml

@@ -0,0 +1,8 @@
+steps:
+  - block: ":rocket: Run this test job"
+    if: build.pull_request.id != null || build.branch =~ /^dependabot\//
+  - label: ":macos: Build and Test XGBoost for MacOS M1 with Clang 11"
+    command: "tests/buildkite/test-macos-m1-clang11.sh"
+    key: mac-m1-appleclang11
+    agents:
+      queue: mac-mini-m1

tests/buildkite/test-macos-m1-clang11.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+
+set -euo pipefail
+
+source tests/buildkite/conftest.sh
+
+# Display system info
+echo "--- Display system information"
+set -x
+system_profiler SPSoftwareDataType
+sysctl -n machdep.cpu.brand_string
+uname -m
+set +x
+
+# Build XGBoost4J binary
+echo "--- Build libxgboost4j.dylib"
+set -x
+mkdir build
+pushd build
+export JAVA_HOME=$(/usr/libexec/java_home)
+cmake .. -GNinja -DJVM_BINDINGS=ON -DUSE_OPENMP=OFF -DCMAKE_OSX_DEPLOYMENT_TARGET=10.15
+ninja -v
+popd
+rm -rf build
+set +x
+
+echo "--- Upload Python wheel"
+set -x
+pushd lib
+mv -v libxgboost4j.dylib libxgboost4j_m1_${BUILDKITE_COMMIT}.dylib
+buildkite-agent artifact upload libxgboost4j_m1_${BUILDKITE_COMMIT}.dylib
+if [[ ($is_pull_request == 0) && ($is_release_branch == 1) ]]
+then
+  aws s3 cp libxgboost4j_m1_${BUILDKITE_COMMIT}.dylib \
+    s3://xgboost-nightly-builds/${BRANCH_NAME}/libxgboost4j/ \
+    --acl public-read --no-progress
+fi
+popd
+set +x
+
+# Ensure that XGBoost can be built with Clang 11
+echo "--- Build and Test XGBoost with MacOS M1, Clang 11"
+set -x
+LLVM11_PATH=$(brew --prefix llvm\@11)
+mkdir build
+pushd build
+cmake .. -GNinja -DCMAKE_C_COMPILER=${LLVM11_PATH}/bin/clang \
+  -DCMAKE_CXX_COMPILER=${LLVM11_PATH}/bin/clang++ -DGOOGLE_TEST=ON \
+  -DUSE_DMLC_GTEST=ON
+ninja -v

tests/ci_build/conda_env/macos_cpu_test.yml

@@ -32,11 +32,10 @@ dependencies:
 - jsonschema
 - boto3
 - awscli
-- py-ubjson
 - cffi
 - pyarrow
 - pyspark>=3.4.0
 - cloudpickle
 - pip:
   - sphinx_rtd_theme
-  - datatable
+  - py-ubjson