Update sitemaps for albums

astro/src/pages/sitemap/index.xml.ts

@@ -1,4 +1,5 @@
 import { getAllBlogs } from "@/content/blogs/blogs";
+import { getAllAlbums } from "@/content/photos/albums";
 import { getAllProjects } from "@/content/projects/projects";
 import { getSettings } from "@/content/settings/settings";
 import type { APIRoute } from "astro";
@@ -59,10 +60,26 @@ export const GET = (async () => {
         });
     };
     if (settings.photo.enabled) {
+        const photoLastModifieds = [
+            settings.photo.lastModified,
+            settings.sitemap.lastModified,
+            settings.website.lastModified
+        ];
+
+        let albums = await getAllAlbums(settings);
+
+        albums.forEach((album) => {
+            photoLastModifieds.push(album.lastModified);
+        });
+
+        const lastModifiedAlbums = photoLastModifieds.sort((a: Date, b: Date) => {
+            return b.getTime() - a.getTime();
+        });
+
         sitemapIndex.push({
             url: "/sitemap/albums.xml",
-            lastModified: new Date()
-        })
+            lastModified: lastModifiedAlbums[0]
+        });
     };
 
     let sitemapContent = `