fix: Add nixpacks configuration for Astro deployment

dealplustech-astro/node_modules/zod-to-json-schema/dist/esm/parsers/optional.js

@@ -0,0 +1,21 @@
+import { parseDef } from "../parseDef.js";
+import { parseAnyDef } from "./any.js";
+export const parseOptionalDef = (def, refs) => {
+    if (refs.currentPath.toString() === refs.propertyPath?.toString()) {
+        return parseDef(def.innerType._def, refs);
+    }
+    const innerSchema = parseDef(def.innerType._def, {
+        ...refs,
+        currentPath: [...refs.currentPath, "anyOf", "1"],
+    });
+    return innerSchema
+        ? {
+            anyOf: [
+                {
+                    not: parseAnyDef(refs),
+                },
+                innerSchema,
+            ],
+        }
+        : parseAnyDef(refs);
+};