m/installer/install: embed bios_bootcode

We have a BIOS bootcode which displays a message that only UEFI boot is
supported, but this was not installed anywhere. Now it's included in the
installer and in installed nodes.

Change-Id: I319fcd30ad3eacbfdcb9bf7d95925e51ff896570
Reviewed-on: https://review.monogon.dev/c/monogon/+/4378
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/installer/install/BUILD.bazel b/metropolis/installer/install/BUILD.bazel
index 1a0fed3..2cd2fdc 100644
--- a/metropolis/installer/install/BUILD.bazel
+++ b/metropolis/installer/install/BUILD.bazel
@@ -3,6 +3,9 @@
 go_library(
     name = "install",
     srcs = ["install.go"],
+    embedsrcs = [
+        "//metropolis/node/bios_bootcode",  #keep
+    ],
     importpath = "source.monogon.dev/metropolis/installer/install",
     visibility = ["//visibility:public"],
     deps = [