[CI] Migrate CI pipelines from Jenkins to BuildKite (#8142)

* [CI] Migrate CI pipelines from Jenkins to BuildKite

* Require manual approval

* Less verbose output when pulling Docker

* Remove us-east-2 from metadata.py

* Add documentation

* Add missing underscore

* Add missing punctuation

* More specific instruction

* Better paragraph structure

tests/buildkite/run-clang-tidy.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+set -euo pipefail
+
+CUDA_VERSION=11.0.3
+
+echo "--- Run clang-tidy"
+
+source tests/buildkite/conftest.sh
+
+tests/ci_build/ci_build.sh clang_tidy docker \
+  --build-arg CUDA_VERSION_ARG=${CUDA_VERSION} \
+  python3 tests/ci_build/tidy.py --cuda-archs 75