Boot QEMU from a user-defined docker image

Fixes #381
15 jobs for qemu-on-docker in 17 minutes and 27 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #92302
amd64
dispatcher-debian-10

00:03:09

passed #92304
amd64
dispatcher-debian-11

00:03:23

passed #92303
amd64
server-debian-10

00:03:35

passed #92305
amd64
server-debian-11

00:06:06

 
  Analyze
passed #92307
amd64
black

00:01:21

passed #92308
amd64
code_quality

00:00:29

passed #92309
amd64
coverage

00:07:19

59.02%
passed #92310
amd64
dockerfiles

00:00:27

passed #92312
amd64
pylint

00:03:11

passed #92306
amd64-dind
sast

00:02:46

passed #92311
amd64
schemas

00:00:38

 
  Build
passed #92314
amd64
debian/10

00:01:51

passed #92313
amd64
doc

00:00:42

passed #92315
amd64-dind
docker-amd64-dispatcher

00:02:06

passed #92316
amd64-dind
docker-amd64-server

00:04:00