Java in Docker

There is no Java includfed in Docker on purpose as this is not needed generally.
However it is required as per-requisite for some storage devices like Hitachui VSF family.

Create new docker file:
```
mkdir xormon-custom
cd xormon-custom; 
```

Edit Dockerfile:

vim Dockerfile

FROM xorux/xormon-ng:latest

RUN apt update && apt install -y \

  default-jre \

  && rm -rf /var/lib/apt/lists/*

Image built:

docker build . -t xorux/xormon-ng-custom

run XM with java xorux/xormon-ng-custom

docker run --init -d --name xormon --ulimit core=0 -p 8443:8443 \
-v /var/xormon-ng/files:/usr/src/app/server-nest/files \
--link timescaledb:timescaledb --env-file ./xormon-ng.env xorux/xormon-ng-custom