fix: fix a bug where multiple files were not written at the root package

BUILD.bazel

@@ -37,7 +37,10 @@ genrule(
 write_source_files(
     name = "write_source_file_root-test",
     diff_test = False,
-    files = {"test-out/dist/write_source_file_root-test": ":write_source_file_root"},
+    files = {
+        "test-out/dist/write_source_file_root-test": ":write_source_file_root",
+        "test-out/dist/write_source_file_root-test_b": ":write_source_file_root",
+    },
 )
 
 # Test that yq works in the root package

lib/private/write_source_file.bzl

@@ -181,7 +181,7 @@ fi
         "# Run the update scripts for all write_source_file deps",
     ])
     for update_script in additional_update_scripts:
-        contents.append("\"{update_script}\"".format(update_script = update_script.short_path))
+        contents.append("./\"{update_script}\"".format(update_script = update_script.short_path))
 
     ctx.actions.write(
         output = updater,