feat: add source control identity management

modules/hosts/polaris/default.nix

@@ -29,6 +29,15 @@ in
       mouse.accelSpeed = 0.4;
     };
 
+    sourceControl.users = {
+      kiri.personal.publicKey = "";
+
+      ergon = {
+        personal.publicKey = "";
+        work.publicKey = "";
+      };
+    };
+
     users = {
       inherit (metaLib.users)
         ergon