cloud/bmaas/bmdb/scruffy: initialize, implement BMDB metrics

This creates a new BMaaS component, Scruffy the Janitor.

Scruffy will run a bunch of housekeeping jobs that aren't tied to a
particular provider or even region. Currently Scruffy just collects BMDB
metrics by periodically polling the BMDB SQL database.

Change-Id: Icafa714811757eaaf31fed43184ded8512bde067
Reviewed-on: https://review.monogon.dev/c/monogon/+/1819
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/cloud/bmaas/scruffy/cmd/BUILD.bazel b/cloud/bmaas/scruffy/cmd/BUILD.bazel
new file mode 100644
index 0000000..5e050bf
--- /dev/null
+++ b/cloud/bmaas/scruffy/cmd/BUILD.bazel
@@ -0,0 +1,18 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "cmd_lib",
+    srcs = ["main.go"],
+    importpath = "source.monogon.dev/cloud/bmaas/scruffy/cmd",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//cloud/bmaas/scruffy",
+        "//metropolis/cli/pkg/context",
+    ],
+)
+
+go_binary(
+    name = "cmd",
+    embed = [":cmd_lib"],
+    visibility = ["//visibility:public"],
+)