Empty permission is produced when creation of archive with proper condition

[miurahr]

When creating archive file with write and writeall method with arcname argument, the archive does not have meaningful permissions.

Related issue

To Reproduce

import py7zr

with py7zr.SevenZipFile(dest / "target.7z", "w") as szf:
    szf.writeall(path="/tmp", arcname="foo")
with py7zr.SevenZipFile(dest/ "target.7z", "r") as szf:
    szf.extractall()

Expected behavior

Should have 0644 permission at least.

Environment (please complete the following information):

• OS: Ubuntu Linux 24.04
• Python: 3.14
• py7zr version: v1.1.0

Test data(please attach in the report):

Additional context

The bug is reported and discussed in miurahr/aqtinstall#983 (comment)