games/factorio: add modproxy

This adds a mod proxy system, called, well, modproxy.

It sits between Factorio server instances and the Factorio mod portal,
allowing for arbitrary mod download without needing the servers to know
Factorio credentials.

Change-Id: I7bc405a25b6f9559cae1f23295249f186761f212
diff --git a/games/factorio/modproxy/BUILD.bazel b/games/factorio/modproxy/BUILD.bazel
new file mode 100644
index 0000000..fb0c344
--- /dev/null
+++ b/games/factorio/modproxy/BUILD.bazel
@@ -0,0 +1,49 @@
+load("@io_bazel_rules_docker//container:container.bzl", "container_image", "container_layer", "container_push")
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["main.go"],
+    importpath = "code.hackerspace.pl/hscloud/games/factorio/modproxy",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//games/factorio/modproxy/modportal:go_default_library",
+        "//games/factorio/modproxy/proto:go_default_library",
+        "//go/mirko:go_default_library",
+        "@com_github_golang_glog//:go_default_library",
+        "@org_golang_google_grpc//codes:go_default_library",
+        "@org_golang_google_grpc//status:go_default_library",
+    ],
+)
+
+go_binary(
+    name = "modproxy",
+    embed = [":go_default_library"],
+    visibility = ["//visibility:public"],
+)
+
+container_layer(
+    name = "layer_bin",
+    files = [
+        ":modproxy",
+        "//games/factorio/modproxy/client:client",
+    ],
+    directory = "/games/factorio/modproxy/",
+)
+
+container_image(
+    name = "runtime",
+    base = "@prodimage-bionic//image",
+    layers = [
+        ":layer_bin",
+    ],
+)
+
+container_push(
+    name = "push",
+    image = ":runtime",
+    format = "Docker",
+    registry = "registry.k0.hswaw.net",
+    repository = "games/factorio/modproxy",
+    tag = "{BUILD_TIMESTAMP}-{STABLE_GIT_COMMIT}",
+)