Merge pull request #29508 from CodethinkLabs/systemd-vmspawn-pr

systemd-vmspawn implementation that only supports disk images

diff --cc man/rules/meson.build
Simple merge

diff --cc meson.build
Simple merge

diff --cc meson_options.txt
Simple merge

diff --cc src/nspawn/nspawn.c
Simple merge

diff --cc src/shared/meson.build
Simple merge