Issue #3365151: CollectPathsToExcludeEvent needs to exclude paths relative to the project root prefixed with './' so they are not ambiguous to rsync

package_manager/src/Event/CollectPathsToExcludeEvent.php

@@ -106,10 +106,13 @@ final class CollectPathsToExcludeEvent extends StageEvent implements PathListInt
       // so that they're totally unambiguous. A path like
       // `/path/to/project/file.php` should become `/file.php`.
       $flag = TRUE;
-      if (is_file($path)) {
+      // Adding is_dir because database file were not being recognised using
+      // is_file.
+      if (is_file($path) || !is_dir($path)) {
         $flag = FALSE;
       }
       $path = str_replace($project_root, '', $path);
+      $path = ltrim($path, '/');
       if ($flag) {
         if ($path[0] == '/') {
           $path = '.' . $path;