cluster/admitomatic: finish up service

This turns admitomatic into a self-standing service that can be used as
an admission controller.

I've tested this E2E on a local k3s server, and have some early test
code for that - but that'll land up in a follow up CR, as it first needs
to be cleaned up.

Change-Id: I46da0fc49f9d1a3a1a96700a36deb82e5057249b
diff --git a/cluster/admitomatic/config/BUILD.bazel b/cluster/admitomatic/config/BUILD.bazel
new file mode 100644
index 0000000..0344526
--- /dev/null
+++ b/cluster/admitomatic/config/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 = "config_proto",
+    srcs = ["config.proto"],
+    visibility = ["//visibility:public"],
+)
+
+go_proto_library(
+    name = "config_go_proto",
+    importpath = "code.hackerspace.pl/hscloud/cluster/admitomatic/config",
+    proto = ":config_proto",
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "go_default_library",
+    embed = [":config_go_proto"],
+    importpath = "code.hackerspace.pl/hscloud/cluster/admitomatic/config",
+    visibility = ["//visibility:public"],
+)