testing/lua-pgmoon: prevent manifest overwrite

The luarocks manifest file is managed by luarocks itself, remove it from
build to prevent overwrite

testing/lua-pgmoon/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=lua-pgmoon
 _rockname="${pkgname#lua-}"
 pkgver=1.10.0
-pkgrel=0
+pkgrel=1
 pkgdesc="A pure Lua Postgres driver for use in OpenResty & more"
 url="https://github.com/leafo/pgmoon"
 license="MIT"
@@ -29,6 +29,8 @@ build() {
 		               LUA_LIBDIR="$(pkg-config --variable=libdir lua$lver)" \
 		               make --tree="./build" \
 		               "$_rockname-dev-1.rockspec"
+
+		rm "./build/lib/luarocks/rocks-$lver/manifest"
 	done
 }