Function sibling_temp_dir

crates/openshell-server/src/certgen.rs:769–777

(dir: &Path)

}

fn sibling_temp_dir(dir: &Path) -> PathBuf {
    // Use a sibling so std::fs::rename succeeds (same filesystem).
    let mut name = dir
        .file_name()
        .map(std::ffi::OsStr::to_os_string)
        .unwrap_or_default();
    name.push(".certgen.tmp");
    dir.with_file_name(name)
}

// ────────────────────────────── Shared utility ─────────────────────────────