m/pkg/pstore: add package to interface with pstore

This adds a package for interfacing with the Linux kernel's pstore
(persistent storage) system. Currently only handles kmsg/dmesg-type logs
as mce has an unknown format and I have no examples.

Change-Id: I3089a53cdca224c7e6e04dd51a94035d7b2b880b
Reviewed-on: https://review.monogon.dev/c/monogon/+/769
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/pkg/pstore/BUILD.bazel b/metropolis/pkg/pstore/BUILD.bazel
new file mode 100644
index 0000000..ac84095
--- /dev/null
+++ b/metropolis/pkg/pstore/BUILD.bazel
@@ -0,0 +1,14 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "pstore",
+    srcs = ["pstore.go"],
+    importpath = "source.monogon.dev/metropolis/pkg/pstore",
+    visibility = ["//visibility:public"],
+)
+
+go_test(
+    name = "pstore_test",
+    srcs = ["pstore_test.go"],
+    embed = [":pstore"],
+)