Create a docker image with postgres

[danshapir]

Hey,

When you want to use this awesome project with k8s and need PostgreSQL, it's extremely hard to achieve without a prebuilt docker image that already contains the PostgreSQL driver preconfigured.

Can you please add to your release?

Thanks,
Dan

[saig0]

Yes! The easiest option would be to include the Postgres driver directly. For example, like it was done recently for ZeeQS: camunda-community-hub/zeeqs#163

[saig0]

Done by #307 🎉