only serve top 1000 packages for collection

lib/api/collection.js

@@ -42,7 +42,7 @@ module.exports = function (router) {
         })
     }
 
-    router.get('/collection.json', router.apicache("6 hours"), async function (req, res) {
+    router.get('/collection.json', router.apicache("12 hours"), async function (req, res) {
       const packages = await router.db.Package.findAll({
         where: {
           processing: false,
@@ -56,16 +56,18 @@ module.exports = function (router) {
           "description.tools_version": {
             [router.db.Sequelize.Op.not]: null
           },
-        }
+        },
+        order: [["info.stargazers_count", "DESC"]],
+        limit: 1000
       })
 
       req.robot.log("packages:")
       req.robot.log(packages)
         // format https://github.com/apple/swift-package-manager/blob/main/Sources/PackageCollectionsModel/Formats/v1.md
         const ans = JSON.stringify({
-            "overview": "A collection of all the Swift packages on the Swift Package Registry",
+            "overview": "A collection of the top 1000 Swift packages on the Swift Package Registry",
             "formatVersion": "1.0",
-            "name": "Packages from the Swift Package Registry",
+            "name": "Top 1000 Packages from the Swift Package Registry",
             "generatedBy": {"name": "The Swift Package Registry"},
             "keywords": ["swift package registry"],
             "packages": map_packages(packages),