Actually allow modifying the replication URL (#297)

Dockerfile

@@ -34,6 +34,9 @@ FROM ubuntu:22.04 AS final
 ENV DEBIAN_FRONTEND=noninteractive
 ENV AUTOVACUUM=on
 ENV UPDATES=disabled
+ENV REPLICATION_URL=https://planet.openstreetmap.org/replication/hour/
+ENV MAX_INTERVAL_SECONDS=3600
+
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
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