NixOS restructuring, move common imports to lib

modules/hosts/nixos/default.nix

@@ -0,0 +1,81 @@
+{ hostname, pkgs, username, ... }: {
+  imports = [
+    ../common/linux/internationalisation.nix
+  ];
+
+  environment = {
+    shells = with pkgs; [ bash zsh ];
+    systemPackages = with pkgs; [
+      age
+      dconf2nix
+      file
+      iftop
+      inetutils
+      iotop
+      neofetch
+      python3
+      sops
+      ssh-to-age
+      sysstat
+      tailscale
+      unzip
+      wget
+      xidel
+    ];
+  };
+
+  fonts.fontDir.enable = true;
+  fonts.packages = with pkgs; [
+    font-awesome
+    (nerdfonts.override {
+      fonts = [
+        "Hack"
+        "SourceCodePro"
+      ];
+    })
+  ];
+
+  networking.hostName = "${hostname}";
+
+  nix.settings = {
+    allowed-users = [ "${username}" ];
+    experimental-features = [
+      "flakes"
+      "nix-command"
+    ];
+    # extra-substituters = [
+    # ];
+    # extra-trusted-public-keys = [
+    # ];
+    substituters = [
+      "https://cache.nixos.org" # default one
+      "https://cache.flox.dev"
+      "https://cosmic.cachix.org/"
+      "https://nixpkgs-terraform.cachix.org"
+    ];
+    trusted-public-keys = [
+      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" # default one
+      "cosmic.cachix.org-1:Dya9IyXD4xdBehWjrkPv6rtxpmMdRel02smYzA85dPE="
+      "flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs="
+      "nixpkgs-terraform.cachix.org-1:8Sit092rIdAVENA3ZVeH9hzSiqI/jng6JiCrQ1Dmusw="
+    ];
+    trusted-users = [ "${username}" ];
+  };
+
+  programs = {
+    bandwhich.enable = true;
+    zsh.enable = true;
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+
+  services = {
+    openssh.enable = true;
+  };
+
+  sops.age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+
+  time.timeZone = "America/New_York";
+
+  users.defaultUserShell = pkgs.zsh;
+}