Add CI job for bazelbuild/bazel-toolchains repo.

Change-Id: I8eb654dc18faf4c97470823c09fb1b9250f830c5
diff --git a/jenkins/jobs/BUILD b/jenkins/jobs/BUILD
index 276b00e..cddcee8 100644
--- a/jenkins/jobs/BUILD
+++ b/jenkins/jobs/BUILD
@@ -119,6 +119,15 @@
     project = "buildtools",
 )
 
+bazel_github_job(
+    name = "bazel-toolchains",
+    config = ":configs/empty.json",
+    gerrit_project = "bazel-toolchains",
+    git_url = "https://bazel.googlesource.com/bazel-toolchains",
+    pr_enabled = False,  # We currently do not accept PR in bazelbuild/bazel-toolchains repo.
+    project = "bazel-toolchains",
+)
+
 # rules_web was renamed to rules_webtesting, keep the legacy name
 # for the job to keep history but use the new project name.
 bazel_github_job(