Device= in [Container] is a [Volume]-group key; the container device key is
AddDevice= (maps to podman --device). Update the /dev/net/tun device line and
the test seam.
The podman quadlet generator fails with "unsupported key 'CapAdd' in group
'Container'" and skips the whole unit. The correct key is AddCapability=
(maps to podman --cap-add). Update the gluetun unit and its test seam.
Converts the podman-compose SearXNG stack to boot-persistent quadlet units so
it survives a reboot (the compose deployment did not). searxng sets
Network=gluetun.container, which makes it reuse gluetun's network namespace so
outbound search traffic exits the WireGuard tunnel; it publishes no port of its
own (the port lives on gluetun). gluetun and valkey join a pinned searxng
network (10.89.2.0/24, DNS-enabled) so searxng reaches valkey by name.
Secrets stay in /opt/searxng/.env (mode 0600), referenced via [Service]
EnvironmentFile= so ${VAR} expands. Adds a bats seam asserting the netns
wiring, port placement, boot install, and that no secret material is tracked.
Frank