Define an Adempiere image connected to external PostgreSQL starting from sources about adempiere-docker

[sramazzina]

Implementation already finished on a forked repository at this url https://github.com/serasoft/adempiereDocker.

The image takes an already compiled binary distribution, made available under a dist directory and generates the ADempiere image. It is possible to launch the system through docker-compose by using the compose file named docker-compose.yml available in directory compose/postgresql.

Waiting for the sources to be merged in the adempiere-docker repository to complete the process.

[sramazzina]

First release of the docker image released today. Give it a try

[sramazzina]

Added new environment variable RESTORE_SEED defaulted to N to prevent the drop and re-creation of an existing ADempiere DB. Useful when we are upgrading the container to a new release.