Update to micronaut

[jamesrwelch]

• Update the Postgres container to a suitable new version (latest)
• Use a latest Eclipse Temeurin image - e.g. https://hub.docker.com/layers/library/eclipse-temurin/21-jdk-noble/images/sha256-d6d958fefb3c62a8711f95f49d3e2d3b82aa0e6834ebd8a886083ae6ef522621
• Remove all the gradle building of the back-end and simply download the compiled jar from the repository
• Instead of deploying the back-end as a .war file, and the UI inside tomcat, run the micronaut jar file, and deploy the interface with nginx or apache httpd. Or investigate getting micronaut to server files from the filesystem

To consider:

• Running database and application in the same container
• Specifying a list of plugins to be deployed (downloading from repository and placing in the class path
• Bootstrapping the application with an existing Postgres dump file

[jamesrwelch]

Split into two components:

1. A build script that builds a docker image and pushes it to Docker Hub. The image should contain Mauro back-end, UI, and Postgres, and all the wiring.
2. A command which pulls and runs the docker image, and creates a volume for the Postgres database to live on.