Cut over to Bazel.

tee/BUILD.bazel

@@ -0,0 +1,8 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "tee",
+    srcs = ["tee.go"],
+    importpath = "git.wntrmute.dev/kyle/goutils/tee",
+    visibility = ["//visibility:public"],
+)