Deployable backend

[myluki2000]

Description of changes

Modify docker-compose.yml to support merging the compose files of all services. This is directly derived from the docker-compose file of the template-microservice.

How has this been tested?

It's a docker-compose file. I ran it.

• [ ] automated unit test
• [ ] automated integration test
• [ ] automated acceptance test
• [x] manual, exploratory test

Checklist before requesting a review

• [x] My code follows the coding guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My code fulfills all acceptance criteria
• [ ] I have added tests that prove my fix is effective or that my feature works
  • Not applicable
• [ ] New and existing unit tests pass locally with my changes
  • Not applicable
• [ ] The test coverage (line and branch) is reasonably high, especially on Service classes and other classes with complex logic
  • Not applicable
• [x] I have made corresponding changes to the documentation
• [ ] I have added explanation of architectural decision and rationales to wiki/adr
• Not applicable

Checklist for reviewer

• [ ] The code works and does not throw errors
• [ ] The code is easy to understand and there are no confusing parts
• [ ] The code follows the coding guidelines of this project
• [ ] The code change accomplishes what it is supposed to do
• [ ] I cannot think of any use case in which the code does not behave as intended
• [ ] The added and existing tests reasonably cover the code change
• [ ] I cannot think of any test cases, input or edge cases that should be tested in addition
• [ ] Description of the change is included in the documentation