Define a CI testing strategy for "local", "staging" and "prodcution" of MicroService

e.g.

All tests are run with ENV variable "environment" = (local, staging, production)

local: 

• Gitlab is local
• Only for testing basic stuff

staging:

• Gitlab is in Qt intra
• For testing things within Qt and pre-production

production:

• Gitlab is qtcloud-registry.qt.io

Goals:

• what happens when developer is making changes to code locally? what is tested then?
• What happens when code is pushed to Gitlab? What tests are run? Where is this automatically deployed?
• What happens when code is pushed to "Production" branch in Gitlab? What tests are run? What job is responsible to "automatically" deploy this to "production"

Finally: Implement all such jobs. Write first versions of all such tests.