m/p/efivarfs: init

This adds a package supporting efivarfs operations.

Change-Id: Ib0d0713a121efaa0ecdd7e70d8c9d27f4697f958
Reviewed-on: https://review.monogon.dev/c/monogon/+/426
Reviewed-by: Leopold Schabel <leo@nexantic.com>
diff --git a/metropolis/pkg/efivarfs/BUILD.bazel b/metropolis/pkg/efivarfs/BUILD.bazel
new file mode 100644
index 0000000..8ef16fb
--- /dev/null
+++ b/metropolis/pkg/efivarfs/BUILD.bazel
@@ -0,0 +1,9 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["efivarfs.go"],
+    importpath = "source.monogon.dev/metropolis/pkg/efivarfs",
+    visibility = ["//visibility:public"],
+    deps = ["@org_golang_x_text//encoding/unicode:go_default_library"],
+)