Jacq

> Hey, thank you for your work. Would it be possible to add tests based on `https://hub.docker.com/r/bitnami/redis-sentinel` (see our https://github.com/PromPHP/prometheus_client_php/blob/main/.github/workflows/tests.yml)? Already added some test and performed a full refactor based...

Added tests, ready to merge. It was tricky to include Redis sentinel service as redis5 does not support resolve hostname.