Revert "[ci] collapse sphinix lint into build_sphinx_docs (#36538)"

This reverts commit 3ced85c.

.buildkite/pipeline.build.yml

@@ -458,7 +458,7 @@
     # See https://stackoverflow.com/questions/63383400/error-cannot-uninstall-ruamel-yaml-while-creating-docker-image-for-azure-ml-a
     # Pin urllib to avoid downstream ssl incompatibility issues. This matches requirements-doc.txt.
     - pip install "mosaicml==0.12.1" "urllib3<1.27" --ignore-installed
-    - ./ci/ci.sh build_sphinx_docs
+    - ./ci/ci.sh build
 
 - label: ":octopus: Tune multinode tests"
   conditions: ["NO_WHEELS_REQUIRED", "RAY_CI_TUNE_AFFECTED"]

ci/ci.sh

@@ -306,9 +306,6 @@ build_dashboard_front_end() {
 }
 
 build_sphinx_docs() {
-  _bazel_build_protobuf
-  install_ray
-
   (
     cd "${WORKSPACE_DIR}"/doc
     if [ "${OSTYPE}" = msys ]; then
@@ -416,8 +413,6 @@ validate_wheels_commit_str() {
 }
 
 build_wheels_and_jars() {
-  _bazel_build_before_install
-
   # Create wheel output directory and empty contents
   # If buildkite runners are re-used, wheels from previous builds might be here, so we delete them.
   mkdir -p .whl
@@ -734,15 +729,23 @@ init() {
 }
 
 build() {
-  if [[ "${NEED_WHEELS}" == "1" ]]; then
-    build_wheels_and_jars
-    return
+  if [ "${LINT-}" != 1 ]; then
+    _bazel_build_before_install
+  else
+    _bazel_build_protobuf
+  fi
+
+  if [[ "${NEED_WHEELS}" != "true" ]]; then
+    install_ray
+    if [ "${LINT-}" = 1 ]; then
+      # Try generating Sphinx documentation. To do this, we need to install Ray first.
+      build_sphinx_docs
+    fi
   fi
 
-  # Build and install ray into the system.
-  # For building the wheel, see build_wheels_and_jars.
-  _bazel_build_before_install
-  install_ray
+  if [[ "${NEED_WHEELS}" == "true" ]]; then
+    build_wheels_and_jars
+  fi
 }
 
 run_minimal_test() {