Update bazel_toolchains to latest release and add toolchain config ta…

…rget for BuildKite CI (rbe_ubuntu1604)

RELNOTES: None.
PiperOrigin-RevId: 237233612

.bazelci/postsubmit.yml

@@ -219,8 +219,10 @@ platforms:
     - "//src:all_windows_tests"
   rbe_ubuntu1604:
     shell_commands:
-    - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
-      android_ndk_repository/android_ndk_repository/' WORKSPACE
+    - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/'
+      -e 's/^# android_ndk_repository/android_ndk_repository/'
+      -e 's/^# rbe_autoconfig/rbe_autoconfig/'
+      -e 's/^# load("@bazel_toolchains/load("@bazel_toolchains/' WORKSPACE
     - rm -f WORKSPACE.bak
     build_targets:
     - "//src:bazel"

.bazelci/presubmit.yml

@@ -276,8 +276,10 @@ platforms:
     - "//src:all_windows_tests"
   rbe_ubuntu1604:
     shell_commands:
-    - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/' -e 's/^#
-      android_ndk_repository/android_ndk_repository/' WORKSPACE
+    - sed -i.bak -e 's/^# android_sdk_repository/android_sdk_repository/'
+      -e 's/^# android_ndk_repository/android_ndk_repository/'
+      -e 's/^# rbe_autoconfig/rbe_autoconfig/'
+      -e 's/^# load("@bazel_toolchains/load("@bazel_toolchains/' WORKSPACE
     - rm -f WORKSPACE.bak
     build_targets:
     - "//src:bazel"

WORKSPACE

@@ -229,14 +229,20 @@ http_file(
 
 http_archive(
     name = "bazel_toolchains",
-    sha256 = "109a99384f9d08f9e75136d218ebaebc68cc810c56897aea2224c57932052d30",
-    strip_prefix = "bazel-toolchains-94d31935a2c94fe7e7c7379a0f3393e181928ff7",
+    sha256 = "4b1468b254a572dbe134cc1fd7c6eab1618a72acd339749ea343bd8f55c3b7eb",
+    strip_prefix = "bazel-toolchains-d665ccfa3e9c90fa789671bf4ef5f7c19c5715c4",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/94d31935a2c94fe7e7c7379a0f3393e181928ff7.tar.gz",
-        "https://github.com/bazelbuild/bazel-toolchains/archive/94d31935a2c94fe7e7c7379a0f3393e181928ff7.tar.gz",
+      "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/d665ccfa3e9c90fa789671bf4ef5f7c19c5715c4.tar.gz",
+      "https://github.com/bazelbuild/bazel-toolchains/archive/d665ccfa3e9c90fa789671bf4ef5f7c19c5715c4.tar.gz",
     ],
 )
 
+# Creates toolchain configuration for remote execution with BuildKite CI
+# for rbe_ubuntu1604.
+# To run the tests with RBE on BuildKite CI uncomment the two lines below
+# load("@bazel_toolchains//rules:rbe_repo.bzl", "rbe_autoconfig")
+# rbe_autoconfig(name = "buildkite_config")
+
 # We're pinning to a commit because this project does not have a recent release.
 # Nothing special about this commit, though.
 http_archive(