build: add bazel rust workflow

src/machoke/BUILD

@@ -0,0 +1,13 @@
+load("@rules_rust//rust:defs.bzl", "rust_binary", "rust_library")
+
+rust_library(
+    name = "machoke_lib",
+    crate_name = "machoke",
+    srcs = ["lib.rs"],
+)
+
+rust_binary(
+    name = "machoke",
+    srcs = ["main.rs"],
+    deps = [":machoke_lib"],
+)