ci: enable buildifier check on ci

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 24f8fb2..51e38fc 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -46,3 +46,12 @@
 go_register_toolchains(version = "1.18.3")
 
 gazelle_dependencies()
+
+# Buildifier
+load("@buildifier_prebuilt//:deps.bzl", "buildifier_prebuilt_deps")
+
+buildifier_prebuilt_deps()
+
+load("@buildifier_prebuilt//:defs.bzl", "buildifier_prebuilt_register_toolchains")
+
+buildifier_prebuilt_register_toolchains()