Stop distributing ISO images
I think that we'll get there at some point and I want a place to track our thoughts.
* We could distribute only USB images for virtual machines.
It requires not-too-complicated magic on the command line for VirtualBox. (#18054)
* DVD represented 5% of WhisperBack reports in 2019/2020.
* In June 2020, ISO images represented:
- 4% of downloads when compairing /install/download and /install/download-iso
- 29% of downloads across all download scenarios, including 17% on /install/vm-download
* I don't think that any of our personas would ever prefer a DVD over a USB stick.
# Prioritization
The benefits are not big enough to initiate this project for its own sake.
So we're waiting until we have another reason to do this, e.g. tails/tails#18086.
# Benefits
- No more #18045+
- Dropping a bunch of pages and code on our website
- Less disk space required on mirrors
- Faster CI: reproducible build & test jobs need to download half less data
- Slightly simpler & faster release process ⇒ lowers time to mitigation a bit
# To Do
* [ ] tails/tails#16906+s
* [ ] tails/tails#18054+s
* [ ] Adjust test suite, which uses ISO images most of the time
* beneficial side effect: this unlocks tails/tails#17495
* [ ] Adjust IUK build code, which uses ISO images
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