Coolify's compose executor rewrites relative bind mounts to a persistent
app dir with no source file, causing docker to auto-create the mount
target as a directory and fail with "not a directory". Delivering the
config through configs.content instead avoids the rewrite entirely and
lets Docker Compose substitute NATS_USER/NATS_PASSWORD at parse time.
Configures a single NATS 2.10 service exposing a WebSocket listener on
:8080 (no_tls; Traefik terminates TLS at nats.volcanic.tes.gd) with
env-driven username/password auth and a persisted JetStream store.
tes