It's a little more than 100€
It's half as much again! If your budget is that flexible you really should have mentioned it in the original post so that people could give you a wider range of options.
Translate it up by a couple of orders of magnitude and you get "I want to buy a car, I have €10,000 to spend" ... "I found one for €15,000, it's a little bit more but ..."
Which would be what, exactly?
Literally the next line on the image tells you what:
"This includes: disability, pregnancy/maternity for the purposes of the mobility assistance use case."
Not really a viable solution for many scenarios though. What if your PDF has half a dozen pages, your answer becomes really tedious. And in a lot of cases a PDF with forms is expected to be sent back to the person or company that created it once the fields have been filled in. They're not likely to want to receive a bunch of JPEG screenshots instead.
From the sidebar
Posts must be relevant to operating systems running the Linux kernel. GNU/Linux or otherwise.
Nothing there saying it's specifically for Linux News.
That all seems ... incredibly complicated.
Why not use fwupd? (link is the Arch wiki but should be relevant for any distro). I've been using fwupd to keep my Dell XPS15 BIOS updated for the last few years, with no problems at all.
I'm still struggling to understand what advantage Docker brings to the set-up.
Maybe the application doesn't need to write anything to disk at all (which seems unlikely) but if so, then you're not saving any disk-write cycles by using docker.
Or maybe you want it only to write to filesystems mounted from longer-life storage e.g. magnetic disk and mark the SD card filesystems as --read-only. In which case you could mount those filesystems directly in the host OS (indeed you have to do this to make them visible to docker) and configure the app to use those directly, no need for docker.
Docker has many great features, but at the end of the day it's just software - it can't magic away some of the foundational limitiations of system architecture.
I'm not sure why Docker would be a particularly good (or particularly bad) fit for the scenario you're referring to.
If you're suggesting that Docker could make it easy to transfer a system onto a new SD card if one fails, then yes that's true ... to a degree. You'd still need to have taken a backup of the system BEFORE the card failed, and if you're making regular backups then to be honest it will make little difference if you've containerised the system or not, you'll still need to restore it onto a new SD card / clean OS. That might be a simpler process with a Docker app but it very much depends on which app and how it's been set up.
Linux doesn't really know about drives, it knows about partitions and mount points.
Obviously this is a simplification, but in general it's close enough. It also could well be your problem - timeshift doesn't know or care that /boot is on the same physical drive as the rest of your system: if it's a different partition, it's separate.