Set up tinc for framework

modules/common/linux/default.nix

@@ -115,7 +115,19 @@ let
   };
 in
 {
-  imports = with modules; [ adb ios graphics wlr logitech kwallet virtualisation accounts rt-audio ];
+  imports = with modules; [
+    ./sops.nix
+
+    adb
+    ios
+    graphics
+    wlr
+    logitech
+    kwallet
+    virtualisation
+    accounts
+    rt-audio
+  ];
 
   options.common.linux = {
     enable = mkOption {

modules/common/linux/sops.nix

@@ -0,0 +1,18 @@
+{ config, lib, ... }:
+with { inherit (lib) types mkOption mkEnableOption; };
+let
+  cfg = config.common.linux.sops;
+in
+{
+  options.common.linux.sops = {
+    enable = mkEnableOption "Enable sops configuration";
+    file = mkOption {
+      type = types.path;
+      description = "Path to the default sops file";
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    sops.defaultSopsFile = cfg.file;
+    sops.age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+  };
+}