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[Docker] Use `SELECT 1` to wait for database

Nik | Klampfradler requested to merge feature/docker-check-using-psql into master

This removes the need to have host and port as environment variables (we might get it in a YAML file from a K8s ConfigMap, or some such). Also, it ensures that the system answering is a database rather than an IoT Waffeleisen with a bad taste in port selection.

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