Add yapf formatting check to CI

Signed-off-by: Ravago Jones <ravagojones@gmail.com>
Change-Id: Iba338003cee4bbab3a059c968f703930286af48d
diff --git a/debian/python_yapf.BUILD b/debian/python_yapf.BUILD
new file mode 100644
index 0000000..c41558c
--- /dev/null
+++ b/debian/python_yapf.BUILD
@@ -0,0 +1,6 @@
+py_binary(
+    name = "python_yapf",
+    srcs = glob(["yapf/**/*.py"]),
+    main = "yapf/__main__.py",
+    visibility = ["//visibility:public"],
+)