Fix snippet commit bug because of different Gitaly error

app/models/snippet_repository.rb

@@ -115,8 +115,10 @@ class SnippetRepository < ApplicationRecord
   end
 
   def invalid_path_error?(err)
-    err.is_a?(Gitlab::Git::Index::IndexError) &&
-      err.message.downcase.start_with?('invalid path', 'path cannot include directory traversal')
+    (err.is_a?(Gitlab::Git::Index::IndexError) &&
+      err.message.downcase.start_with?('invalid path', 'path cannot include directory traversal')) ||
+    (err.is_a?(Gitlab::Git::CommandError) &&
+      err.message.include?('CreateFile: invalid path'))
   end
 
   def invalid_signature_error?(err)

changelogs/unreleased/322096-fj-fix-regression-in-snippet-background-migration.yml

+---
+title: Fix snippet commit bug because of different Gitaly error
+merge_request: 54662
+author:
+type: fixed

spec/models/snippet_repository_spec.rb

@@ -286,6 +286,7 @@ RSpec.describe SnippetRepository do
 
     context 'with git errors' do
       it_behaves_like 'snippet repository with git errors', 'invalid://path/here', described_class::InvalidPathError
+      it_behaves_like 'snippet repository with git errors', '.git/hooks/pre-commit', described_class::InvalidPathError
       it_behaves_like 'snippet repository with git errors', '../../path/traversal/here', described_class::InvalidPathError
       it_behaves_like 'snippet repository with git errors', 'README', described_class::CommitError