Add yapf formatting check to CI

Signed-off-by: Ravago Jones <ravagojones@gmail.com>
Change-Id: Iba338003cee4bbab3a059c968f703930286af48d
diff --git a/tools/lint/run-ci.sh b/tools/lint/run-ci.sh
index a036c06..5e48da6 100755
--- a/tools/lint/run-ci.sh
+++ b/tools/lint/run-ci.sh
@@ -89,6 +89,10 @@
     ./tools/lint/prettier
 }
 
+yapf() {
+    ./tools/lint/yapf
+}
+
 git_status_is_clean() {
     cd "${BUILD_WORKSPACE_DIRECTORY}"
     if ! git diff --quiet; then
@@ -110,6 +114,7 @@
     tweak_cargo_raze
     buildifier
     prettier
+    yapf
     git_status_is_clean  # This must the last linter.
 )