split up no-rgb and secureboot

secureboot.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  boot = {
+    loader.systemd-boot.enable = lib.mkForce false;
+
+    lanzaboote = {
+      enable = true;
+      # needed to be in `/etc/secureboot` for sbctl to work
+      pkiBundle = "/etc/secureboot";
+    };
+
+  };
+  system.activationScripts = {
+    # extract secureboot keys from agenix-decrypted tar
+    "secureboot-keys" = {
+      deps = [ "agenix" ];
+      text = ''
+        #!/bin/sh
+        rm -fr ${config.boot.lanzaboote.pkiBundle} || true
+        mkdir -p ${config.boot.lanzaboote.pkiBundle}
+        ${pkgs.gnutar}/bin/tar xf ${config.age.secrets.secureboot-tar.path} -C ${config.boot.lanzaboote.pkiBundle}
+        chown -R root:wheel ${config.boot.lanzaboote.pkiBundle}
+        chmod -R 500 ${config.boot.lanzaboote.pkiBundle}
+      '';
+    };
+  };
+}