- Changed `ReproducibleZipFile` to also overwrite file-system permissions with fixed values. These default to `0o644` (`rw-r--r--`) for files and `0o755` (`rwxr-xr-x`) for directories.
- Added support for `REPRO_ZIPFILE_FILE_MODE` and `REPRO_ZIPFILE_DIR_MODE` environment variables for overriding the fixed file and directory permission values.