hyphenated hostnames break metadata processing

@NGTmeaty and I discovered that hostnames containing hyphens (ex. crawl-hq23) break draintasker's processing when uploading files to petabox. At the time of writing this issue, here is an example - https://archive.org/details/SPNOUTLINKS-20250908193000723-00167-hq23. Note the misconfigured metadata (Firstfileserial and Lastfileserial are wrong, etc.) and the filesnames in the item are also wrong.