Initial commit. Add configuration for NixOS Proxmox image

config/common/default-state-version.nix

@@ -0,0 +1,17 @@
+# Set a default state version.
+# Sources for this configuration:
+# - a generated NixOS 23.05 configuration
+
+{ config, pkgs, lib, ... }:
+
+{
+  # Set a default state version for good measure.
+  # NixOS 23.05 configuration comment:
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = lib.mkDefault "23.05";
+}