Rename the Maintenance > Backup & Restore page to Backup & Support and
add a Support Bundle card. Download support runs the on-device
`support collect` tool, which gathers configuration, logs, routing,
interfaces, hardware inventory, and container and service status into a
single archive; the WebUI runs as root so the collection is complete.
The handler buffers the archive and only commits response headers once
collection succeeds, so a mid-collection failure is a clean error rather
than a truncated download. An optional password encrypts the bundle via
the tool's GPG support, fed on stdin so it never reaches the process
list. Collection blocks for up to a minute with no output, so the write
deadline is extended past the server's 15s WriteTimeout and nginx gets a
matching read timeout; the browser shows a "collecting" state and saves
the blob client-side using the server's filename.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
Joachim Wiberg
629f0aa74a