data model: migration

deployment/data-model-test.nix

@@ -52,6 +52,10 @@ in
                 };
               };
             };
+            migrations.boo = {
+              deployment = config.deployments.baz;
+              runtime-environment = config.runtime-environments.bar;
+            };
           }
         );
       in

deployment/data-model.nix

@@ -89,5 +89,9 @@ in
       description = "Deployment of a configuration of applications to a run-time environment";
       type = attrsOf deployment;
     };
+    migrations = mkOption {
+      description = "Migrations from Fediversity deployments to Fediversity run-time environments";
+      type = attrsOf migration;
+    };
   };
 }