feat: generalize SSH key config

modules/lib/schema.nix

@@ -25,6 +25,22 @@ let
     }
   );
 
+  sshKeyType = lib.types.submodule (
+    { name, ... }:
+    {
+      options = {
+        publicKey = lib.mkOption {
+          type = lib.types.str;
+        };
+
+        privateKeyPath = lib.mkOption {
+          type = lib.types.str;
+          default = "~/.ssh/id_${name}";
+        };
+      };
+    }
+  );
+
   accountType = lib.types.submodule (
     { config, ... }:
     {
@@ -107,40 +123,6 @@ let
     }
   );
 
-  sourceControlMachineKeyType = lib.types.submodule (
-    { name, ... }:
-    {
-      options = {
-        publicKey = lib.mkOption {
-          type = lib.types.nullOr lib.types.str;
-          default = null;
-        };
-
-        privateKeyPath = lib.mkOption {
-          type = lib.types.str;
-          default = "~/.ssh/id_${name}";
-        };
-      };
-    }
-  );
-
-  sourceControlMachineType = lib.types.submodule (
-    { ... }:
-    {
-      options = {
-        personal = lib.mkOption {
-          type = lib.types.nullOr sourceControlMachineKeyType;
-          default = null;
-        };
-
-        work = lib.mkOption {
-          type = lib.types.nullOr sourceControlMachineKeyType;
-          default = null;
-        };
-      };
-    }
-  );
-
   machineType = lib.types.submodule (
     { name, config, ... }:
     {
@@ -164,8 +146,8 @@ let
           default = { };
         };
 
-        sourceControl = lib.mkOption {
-          type = sourceControlMachineType;
+        sshKeys = lib.mkOption {
+          type = lib.types.attrsOf sshKeyType;
           default = { };
         };