use proper file-path in git-settings for siblings

datalad_next/patches/replace_create_sibling_ria.py

@@ -612,6 +612,8 @@ def _create_sibling_ria(
             'externaltype=ora',
             'encryption=none',
             'autoenable=true',
+            # De-canonify the URL, because git-annex expects the path anchor in
+            # the netloc position.
             f'url={de_canonify_url(url)}']
         if push_url:
             special_remote_options.append(f'push-url={de_canonify_url(push_url)}')
@@ -765,7 +767,9 @@ def _create_sibling_ria(
     yield from ds.siblings(
         'configure',
         name=name,
-        url=str(repo_path) if url.startswith("ria+file") else git_url,
+        url=str(LocalIO().url2transport_path(repo_path))
+        if url.startswith("ria+file")
+        else git_url,
         pushurl=git_push_url,
         recursive=False,
         # Note, that this should be None if storage_sibling was not set