Use full instance url for cache key (#243)

Closes #240

Reviewed-on: https://codeberg.org/rimgo/rimgo/pulls/243
Reviewed-by: orangix <orangix@noreply.codeberg.org>
Co-authored-by: video-prize-ranch <cb.8a3w5@simplelogin.co>
Co-committed-by: video-prize-ranch <cb.8a3w5@simplelogin.co>

main.go

@@ -96,7 +96,7 @@ func main() {
 			Expiration: 30 * time.Minute,
 			MaxBytes:   25000000,
 			KeyGenerator: func(c *fiber.Ctx) string {
-				return utils.GetInstanceProtocol(c) + " " + c.OriginalURL()
+				return utils.GetInstanceUrl(c) + c.OriginalURL()
 			},
 			CacheControl:         true,
 			StoreResponseHeaders: true,