Add a design document for `dev_scripts/env.py`, which is a script that
creates Dangerzone environments for various Linux distros. In this
design document, we explain various architectural decisions that we have
taken for this script, as well as how it works under the hood, what are
its shortcomings, etc.
Refs #286
Introduce `dev_scripts/env.py`, which is a script for building
Dangerzone environments for various Linux distros, and running commands
in them.
Closes#286
Instability in the automated tests sometimes would sometimes fail when
running "podman images --format {{.ID}}". It turns out that in versions
prior to podman 4.3.0, podman volumes (stored in
~/.local/share/contaiers) would get corrupted when multiple tests were
run in parallel.
The current solution is to wrap the test command to run sequentially in
versions prior to the fix and in parallel for versions after that.
Fixes#217
