search engines: added a -> alpine packages

custom-search-engines

@@ -1,5 +1,6 @@
 # https://github.com/philc/vimium/wiki/Search-Engines
 
+a: https://pkgs.alpinelinux.org/packages?arch=x86_64&name=%s alpine packages
 d: https://packages.debian.org/search?suite=all&section=all&arch=any&searchon=names&keywords=%s debian packages
 m: https://www.openstreetmap.org/search?query=%s openstreetmap
 w: https://en.wikipedia.org/w/index.php?title=Special:Search&search=%s wikipedia:en