Default permissions make added file unreadable on linux after unpacking

[konstin]

Reproducer repo: https://github.com/konstin/async-zip-permission

By default, a file added to the archive has 0 (----------) permissions, i.e. when unpacked on linux, you can't open it. By comparison, the default umask for new files on my ubuntu machine is 664 (-rw-rw-r--). The zip crate also uses a similar default of 644: https://docs.rs/zip/latest/zip/write/struct.FileOptions.html#method.unix_permissions