use copy with the correct paths to fix builds that include appcenter (#289)

Author: kgrubb

build.sh

@@ -48,10 +48,11 @@ build () {
 
   # Symlink chosen package lists to where live-build will find them
   ln -s "package-lists.$PACKAGE_LISTS_SUFFIX" "config/package-lists"
-  # symlink appcenter archive
+
+  # copy appcenter list & key
   if [ "$INCLUDE_APPCENTER" = "yes" ]; then
-    ln -s "appcenter/appcenter.list.binary" "archives/appcenter.list.binary"
-    ln -s "appcenter/appcenter.key.binary" "archives/appcenter.key.binary"
+    cp "config/appcenter/appcenter.list.binary" "config/archives/appcenter.list.binary"
+    cp "config/appcenter/appcenter.key.binary" "config/archives/appcenter.key.binary"
   fi
 
   echo -e "