systemd · pro · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/systemd/system/appsvc.service that runs with an automatically managed transient account. In [Service] set User=appsvc, Group=appsvc, DynamicUser=yes, StateDirectory=appsvc (so /var/lib/appsvc is created and owned for it), ReadWritePaths=/var/lib/appsvc, and ExecStart=/usr/bin/appsvc. (Authored config, graded structurally — the engine isn't run here.)
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