lint: Add disabled clang-format linter

A follow-up patch will enable the linter and run clang-format on the
entire repo. You'll be able to run it in one of two ways:

    $ bazel run //tools/lint:clang_format

and, along with all the other linters once its enabled:

    $ bazel run //tools/lint:run-ci

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I1dab4e682096826ee57d70f8c82662d9c2c33217
diff --git a/tools/lint/BUILD b/tools/lint/BUILD
index 23ba4d6..a881124 100644
--- a/tools/lint/BUILD
+++ b/tools/lint/BUILD
@@ -7,6 +7,17 @@
 )
 
 sh_binary(
+    name = "clang_format",
+    srcs = ["clang_format.sh"],
+    data = [
+        "@llvm_k8//:bin",
+    ],
+    deps = [
+        "@bazel_tools//tools/bash/runfiles",
+    ],
+)
+
+sh_binary(
     name = "gofmt",
     srcs = ["gofmt.sh"],
     data = [
@@ -70,6 +81,7 @@
     ],
     data = [
         ":buildifier",
+        ":clang_format",
         ":gofmt",
         ":prettier",
         ":rustfmt",