Unlink any existing file before writing in writeFileWithMode so the
mode option is always applied on fresh file creation (Node.js ignores
mode for existing files). This prevents inheriting wrong permissions
on Docker bind-mount filesystems such as Synology NAS where ACLs can
cause SSH key files to be created with 755 instead of 600.
The fs.unlink error is only swallowed for ENOENT (file doesn't exist);
other errors (e.g. EPERM) propagate as before. The chmod call is kept
as an additional safety net against umask effects.
A test for the new-file creation case is added alongside the existing
existing-file rewrite test.
Agent-Logs-Url: https://github.com/mowdep/zerobyte/sessions/2a4ab129-9668-402e-8687-d792f9b9e704
Co-authored-by: mowdep <10937987+mowdep@users.noreply.github.com>
