Add linter workflow (#33)

third_party/blake3/BUILD.bazel

@@ -2,10 +2,12 @@
 # BLAKE3 is a very fast cryptographic hash function, see README.md for details.
 #
 
-licenses(["unencumbered"])  # Creative Commons CC0
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
 
 package(default_visibility = ["//visibility:public"])
 
+licenses(["unencumbered"])  # Creative Commons CC0
+
 exports_files(["LICENSE"])
 
 config_setting(