m/p/localregistry: init

Adds the localregistry package, which serves Bazel-built container
images via the Docker/OCI V2 registry API.

This will be used to serve test images instead of preseeding them.

Change-Id: I0c2ceb9a83f807c9c87ab03bc1141ca67cc64268
Reviewed-on: https://review.monogon.dev/c/monogon/+/1926
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/metropolis/pkg/localregistry/spec/BUILD.bazel b/metropolis/pkg/localregistry/spec/BUILD.bazel
new file mode 100644
index 0000000..3d6b734
--- /dev/null
+++ b/metropolis/pkg/localregistry/spec/BUILD.bazel
@@ -0,0 +1,23 @@
+load("@rules_proto//proto:defs.bzl", "proto_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
+
+proto_library(
+    name = "spec_proto",
+    srcs = ["manifest.proto"],
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "spec_go_proto",
+    importpath = "source.monogon.dev/metropolis/pkg/localregistry/spec",
+    proto = ":spec_proto",
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "spec",
+    embed = [":spec_go_proto"],
+    importpath = "source.monogon.dev/metropolis/pkg/localregistry/spec",
+    visibility = ["//visibility:public"],
+)