The bundled Dockerfile.openldap image's own redis-server binds to
loopback only inside its container (no --bind override), so
Docker's -p 6379:6379 forward from the runner could never actually
reach it -- confirmed by the first real CI run failing with
"Socket closed unexpectedly" the instant the test process tried to
connect. Worked when tested locally only by accident: my override
env vars didn't actually take effect (model-redis's setUpTable only
reads a nested redisConf key, not flat host/port), so the app fell
back to createClient({})'s localhost:6379 default and happened to
hit my own pre-existing local Redis instead of the container's.
Fix: a dedicated redis:7-alpine GHA service container, which binds
correctly and is reachable at localhost:6379 -- matching that same
default, no env override needed.
wmantly
81e36c9928