pkgs/bijwerken-*,modules/bijwerken: Consolidate system update management and refactor under the same name

pkgs/bijwerken-poke/bijwerken-poke.sh

@@ -0,0 +1,5 @@
+#!/usr/bin/env bash
+
+TARGETS="$(nix --extra-experimental-features "nix-command flakes" eval --raw ".#nixosConfigurations" --apply "nixosConfigurations: builtins.concatStringsSep \"\\n\" (builtins.attrValues (builtins.mapAttrs (name: host: host.config.networking.fqdn) nixosConfigurations))")"
+
+pssh -h <(echo "${TARGETS}") -i -- sudo systemctl start bijwerken-system-upgrade.service --no-block

pkgs/bijwerken-poke/default.nix

@@ -0,0 +1,10 @@
+{ pkgs, ... }:
+
+pkgs.writeShellApplication {
+  name = "bijwerken-poke";
+  text = builtins.readFile ./bijwerken-poke.sh;
+  runtimeInputs = with pkgs; [
+    pssh
+  ];
+}
+