xbps/repositories/mirrors/index: add repo-fastly

Author: classabbyamp

src/xbps/repositories/mirrors/index.md

@@ -17,6 +17,7 @@ map to any tier 1 mirror.
 
 | Repository                                     | Region        | Location           |
 |------------------------------------------------|---------------|--------------------|
+| <https://repo-fastly.voidlinux.org/>           | Global        | Fastly Global CDN  |
 | <https://repo-fi.voidlinux.org/>               | Europe        | Helsinki, Finland  |
 | <https://repo-de.voidlinux.org/>               | Europe        | Frankfurt, Germany |
 | <https://mirrors.servercentral.com/voidlinux/> | North America | Chicago, USA       |