[QA][CI] Have tests running with various deployment setup in CI

[saw-jan]

Currently, we run tests against the ocis server started from a single binary. We want to have a CI setup where we can start multiple instances of a service (as a load balancing) so that we can test against various deployment strategies.

Tasks

• [ ] one ocis & 2 storage user services. try to spin it up in drone-ci (without Kubernetes)
• [ ] try to run e2e tests on that setup
• [ ] check the logs if both services receive requests

Taken from:

• https://github.com/owncloud/ocis/issues/7363
• https://confluence.owncloud.com/pages/viewpage.action?pageId=58296733

[SagarGi]

@saw-jan This issue needs to be discussed whether to invest time for doing and running such things in drone as it seems to be whole lot of task.