Add common hosts config

hosts/common/global/default.nix

@@ -0,0 +1,67 @@
+# Common config for all hosts
+
+{
+  inputs,
+  outputs,
+  ...
+}:
+{
+  imports =
+    [
+      ./fish.nix # fish for admin
+      ./locale.nix
+      ./nix.nix
+      ./openssh.nix
+      ./podman.nix
+      ./sops.nix
+    ]
+    ++ [
+      inputs.home-manager.nixosModules.home-manager
+    ]
+    ++ (builtins.attrValues outputs.nixosModules);
+
+  home-manager.useGlobalPkgs = true;
+  home-manager.extraSpecialArgs = {
+    inherit inputs outputs;
+  };
+
+  # Apply overlays
+  nixpkgs = {
+    overlays = builtins.attrValues outputs.overlays;
+    config = {
+      allowUnfree = true;
+    };
+  };
+
+  nix.settings.auto-optimise-store = true;
+  nix.settings.experimental-features = [
+    "nix-command"
+    "flakes"
+  ];
+
+  # Setup binary caches
+  nix.settings = {
+    substituters = [
+      "https://nix-community.cachix.org"
+      "https://cache.nixos.org/"
+      "https://hyprland.cachix.org"
+      "http://binarycache.julian-mutter.de"
+    ];
+    trusted-public-keys = [
+      "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      "hyprland.cachix.org-1:a7pgxzMz7+chwVL3/pzj6jIBMioiJM7ypFP8PwtkuGc="
+      "binarycache.julian-mutter.de:oJ67uRFwRhNPKL58CHzy3QQLv38Kx7OA1K+6xlEPu7E="
+    ];
+
+    trusted-users = [ "@wheel" ]; # needed for devenv to add custom caches
+  };
+
+  nix.gc = {
+    automatic = true;
+    dates = "weekly";
+    options = "--delete-older-than 30d";
+  };
+
+  programs.nix-ld.enable = true;
+
+}