refactor(modules): make sure nothing is added without setting enable

modules/server/default.nix

@@ -2,11 +2,16 @@
   inherit (lib) mkOption types;
 in {
   imports = [
-    ./sshd.nix
-    ./tailscale.nix
+    ./sshd
+    ./tailscale
   ];
 
   options.roles.server = {
+    enable = mkOption {
+      type = types.bool;
+      default = false;
+    };
+
     user = mkOption {
       type = types.str;
       description = ''

modules/server/sshd/default.nix

@@ -7,7 +7,7 @@
 
   cfg = config.roles.server;
 in {
-  config = mkIf cfg.sshd.enable {
+  config = mkIf (cfg.enable && cfg.sshd.enable) {
     services = {
       openssh = {
         enable = true;
@@ -29,5 +29,5 @@ in {
   };
 
   # For accurate stack trace
-  _file = ./sshd.nix;
+  _file = ./default.nix;
 }

modules/server/tailscale/default.nix

@@ -8,7 +8,7 @@
 
   cfg = config.roles.server;
 in {
-  config = mkIf cfg.tailscale.enable {
+  config = mkIf (cfg.enable && cfg.tailscale.enable) {
     services = {
       tailscale = {
         enable = true;
@@ -48,5 +48,5 @@ in {
   };
 
   # For accurate stack trace
-  _file = ./tailscale.nix;
+  _file = ./default.nix;
 }