{image,flatpak}-builder: Install packaged version of debos

Convert the image-builder to use the packaged versions of fakemachine and debos which includes the new automatic backend selection depending on the environment.

Also add automatic tests to make sure that debos does the right thing when presented with various runners.

CC @em

changed target branch from apertis/v2022dev1 to apertis/v2022dev0

added 1 commit

• ea6af6df - test

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added 4 commits

• 9bf66a60 - Revert "Drop the APT GPG key from images that get it via the base container"
• 5052c845 - image-builder: test-recipe: Check fakemachine backend
• a15193e9 - image-builder: Run smoke test on shared runner
• b6af5b72 - image-builder: Run smoke test on kvm runner

Compare with previous version

added 5 commits

• 7665ee75 - 1 commit from branch apertis/v2022dev0
• 663fb5a0 - {image,flatpak}-builder: Install packaged version of debos
• 85e3341c - image-builder: test-recipe: Check fakemachine backend
• 6e97c835 - image-builder: Run smoke test on shared runner
• 94959c4e - image-builder: Run smoke test on kvm runner

Compare with previous version

assigned to @sjoerd

changed the description

merged

mentioned in merge request !155 (merged)

mentioned in merge request !156 (merged)