fix(sitemap): ensure all canonical URL (#4225)

Author: krisantrobus

packages/paste-website/src/pages/sitemap.xml.tsx

@@ -12,9 +12,15 @@ export const getServerSideProps: GetServerSideProps = async ({ res }) => {
   const sitemap = `<?xml version="1.0" encoding="UTF-8"?>
     <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
       ${SITEMAP.map((url) => {
+        let fullUrl = `${BASE_URL}${url}`;
+
+        if (!fullUrl.endsWith("/")) {
+          fullUrl += "/";
+        }
+
         return `
             <url>
-              <loc>${BASE_URL}${url}</loc>
+              <loc>${fullUrl}</loc>
               <changefreq>daily</changefreq>
               <priority>0.7</priority>
             </url>