feat: latest download api

pages/api/download.js

@@ -0,0 +1,12 @@
+// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
+import getLatestRelease from "../../util/cache"
+
+export default async function handler(req, res) {
+  const data = await getLatestRelease()
+  // get version name template from query, e.g. ?tpl=Gopeed-$version-ios.ipa
+  const { tpl } = req.query
+  // replace $version with version name
+  const filename = tpl.replace('$version', data.tag_name)
+  // redirect to download url
+  res.redirect(`https://github.com/GopeedLab/gopeed/releases/latest/download/${filename}`)
+}