On-prem deploy jobs

This is to set up on-prem deploy jobs, which are currently broken in jenkins. This should not alter any of the cloud deployment steps that are unrelated.

• add a gitlab pipeline job to build the database container,
• (carefully, to not store secrets) add the configuration scripts that generate the docker stack yaml, and
• add a gitlab pipeline job to deploy the webservice to the on-prem container servers

mentioned in merge request !226 (merged)

marked the checklist item add a gitlab pipeline job to build the database container, as completed

marked the checklist item (carefully, to not store secrets) add the configuration scripts that generate the docker stack yaml, and as completed

marked the checklist item add a gitlab pipeline job to deploy the webservice to the on-prem container servers as completed

mentioned in commit a4159ee1

closed with merge request !226 (merged)