Add bazel-toolchains repo to gerrit-github syncing.

Change-Id: I457ebf2eb4acf0491db6d5132369cccdf87fc112
diff --git a/gerrit-github-sync/gerrit-github-sync.sh b/gerrit-github-sync/gerrit-github-sync.sh
index c9686f9..40aeedc 100644
--- a/gerrit-github-sync/gerrit-github-sync.sh
+++ b/gerrit-github-sync/gerrit-github-sync.sh
@@ -25,6 +25,7 @@
     "https://bazel.googlesource.com/continuous-integration git@github.com:bazelbuild/continuous-integration.git continuous-integration false master"
     "https://bazel.googlesource.com/devtools git@github.com:bazelbuild/devtools.git devtools false master"
     "https://bazel.googlesource.com/eclipse git@github.com:bazelbuild/eclipse.git eclipse true master"
+    "https://bazel.googlesource.com/bazel-toolchains git@github.com:bazelbuild/bazel-toolchains.git bazel-toolchains false master"
 )
 
 # Install certificates