[support] devzwf - brscan-skey

Support for Docker image brscan-skey

Application Name: brscan-skey

Application Site: https://github.com/devzwf/brscan-skey-docker
Application repository: https://github.com/devzwf/brscan-skey-docker

Overview:
Brother "Scan to PC" button → multi-page PDF in a folder.
Made for Paperless-ngx, works with any folder. For models without Scan to FTP / Network.

Press SCAN → Scan to PC on a Brother network scanner and get a multi-page PDF in a folder: the Paperless-ngx consume folder, a Nextcloud folder, an SMB share, and so on.

This is useful on models that have no "Scan to FTP / Network / SharePoint" menu (many North American models, such as the DCP-L2550DW). The container runs Brother's brscan-skey daemon. It registers with the device, waits for the button, scans with SANE and writes the PDF.

• Takes every page in the document feeder. When the feeder is empty, it scans the glass.

• Writes compact PDFs: JPEG for gray and colour, CCITT G4 for black & white. The page size is preserved.

• Writes each file atomically, so a watcher such as Paperless never picks up a half-written file. The owner is configurable (PUID/PGID, default 99:100 for Unraid).

• Runs on linux/amd64 only, because Brother publishes x86 drivers only.