Description

The docker files used hard-wired addresses for common environments. Both, frontend and backend, can now use environment variables instead:

• ci: Dockerfile for frontend uses substring mechanism to update environment variables in built files
• ci: Dockerfile for frontend uses nginx unpriviledged
• ci: Dockerfile for backend now can use environment variables for application.properties
• fix: application.properties were outdated.
• ci: added docker-compose for both
• docs: updated INSTALL.mds

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• Copyright and license header are present on all affected files