Jobscheduler does not start in staging

[niraymak]

Describe the bug
Jobscheduler does not start on staging environment

Expected behavior
JobScheduler needs to start up properly on staging environment

[niraymak]

The worker service called: JobScheduler was merged to develop earlier. Unfortunately there were some problems starting. The problems regarding starting were because of mistakes in the docker-compose-staging (and production) files. There was a typo and the JobScheduler was not in the same network as the Identity server and API server.

Another issue found was the JobScheduler not working in a local Docker container due to certificate problems. A new issue was created to find out how we can solve this. For now it is possible to test the JobScheduler locally non Docker.

While testing I encountered a problem where the UserTask layer did not retrieve users so I created a new method for retrieving user tasks including users.

Because there are no unit tests yet for the JobScheduler I created a new issue for it. #381