ci: set up caretaker configuration for ng-dev

Author: josephperrott

.ng-dev/caretaker.mjs

@@ -0,0 +1,6 @@
+/**
+ * Configuration for the `ng-dev caretaker` command.
+ *
+ * @type { import("../ng-dev/index.js").CaretakerConfig }
+ */
+export const caretaker = {};

.ng-dev/config.mjs

@@ -2,3 +2,4 @@ export {format} from './format.mjs';
 export {github} from './github.mjs';
 export {pullRequest} from './pull-request.mjs';
 export {commitMessage} from './commit-message.mjs';
+export {caretaker} from './caretaker.mjs';