Not quite sure if it is related to the other bug I reported just before, but even after I managed to deploy the containers by upgrading the RP to 1.7.0, I am still unable to start my services as they fail to form a cluster and shutdown themselves after repeated failure.
However I do notice this error message in the log file, which might be related to this issue:
2019-02-07T16:38:19.967Z [warn] akka.util.ManifestInfo [sourceThread=main, akkaTimestamp=16:38:19.955UTC, akkaSource=ManifestInfo(akka://application), sourceActorSystem=application] - Detected possible incompatible versions on the classpath. Please note that a given Akka version MUST be the same across all modules of Akka that you are using, e.g. if you use [2.5.20] all other modules that are released together MUST be of the same version. Make sure you're using a compatible set of libraries. Possibly conflicting versions [2.5.19, 2.5.20] in libraries [akka-persistence:2.5.19, akka-cluster-sharding:2.5.19, akka-protobuf:2.5.19, akka-persistence-query:2.5.19, akka-actor:2.5.20, akka-slf4j:2.5.19, akka-remote:2.5.19, akka-cluster:2.5.19, akka-distributed-data:2.5.19, akka-stream:2.5.19, akka-cluster-tools:2.5.19]