Add integration tests for operator output
- Implement dry-run mode for operator: will only print the changes, but not send them to the DNS server (required for testing)
- Add integration tests running Paas Staging cluster: currently only the "regular" ingress controller use-cases is tested, not LB ingress controllers
- Move base image to CS8: this avoids installing large amounts of updates for each image build
The original motivation for adding integration tests was the regression that we didn't publish our IPv6 records for a while: !7 (merged)
Closes #7 (closed)