aptly/docs/Files.md

Upload Package Files

In order to add debian package files to a local repository, files are first uploaded to a temporary directory. Then the directory (or a specific file within) is added to a repository. After adding to a repositorty, the directory resp. files are removed bt default.

All uploaded files are stored under <rootDir>/upload/<tempdir> directory.

For concurrent uploads from CI/CD pipelines, make sure the tempdir is unique.