Revert "Delete pre-install.xql"

This reverts commit f947f69a

pre-install.xql

+xquery version "1.0";
+
+import module namespace xdb="http://exist-db.org/xquery/xmldb";
+
+(: The following external variables are set by the repo:deploy function :)
+
+(: file path pointing to the exist installation directory :)
+declare variable $home external;
+(: path to the directory containing the unpacked .xar package :)
+declare variable $dir external;
+(: the target collection into which the app is deployed :)
+declare variable $target external;
+
+declare function local:mkcol-recursive($collection, $components) {
+    if (exists($components)) then
+        let $newColl := concat($collection, "/", $components[1])
+        return (
+            xdb:create-collection($collection, $components[1]),
+            local:mkcol-recursive($newColl, subsequence($components, 2))
+        )
+    else
+        ()
+};
+
+(: Helper function to recursively create a collection hierarchy. :)
+declare function local:mkcol($collection, $path) {
+    local:mkcol-recursive($collection, tokenize($path, "/"))
+};
+
+(: store the collection configuration :)
+local:mkcol("/db/system/config", $target),
+xdb:store-files-from-pattern(concat("/db/system/config", $target), $dir, "*.xconf")
\ No newline at end of file