release.nix: add to populate binary cache

Previously, the binary cache just built img/combined, which was not
very obvious or extensible.  I'd like to have it build development
shells, as well as possibly replacement bootstrap tools for
aarch64-unknown-linux-musl until we can get them updated upstream.

Signed-off-by: Alyssa Ross <hi@alyssa.is>

1 files changed, 10 insertions, 0 deletions

diff --git a/release.nix b/release.nix
new file mode 100644
index 0000000..ab753ac
--- /dev/null
+++ b/release.nix
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: MIT
+# SPDX-FileCopyrightText: 2022 Alyssa Ross <hi@alyssa.is>
+
+# This file is built to populate the binary cache.
+
+{ pkgs ? import <nixpkgs> {} }:
+
+{
+  combined = import img/combined/run-vm.nix { inherit pkgs; };
+}