* implement a runner for e2e tests
* move e2e tests to a Docker container
* integrate e2e tests into build pipelines
* add tests for multi-namespace support and logical backup jobs
* @FxKu implement the first e2e test for failovers
Helm chart, that contains all required components to install postgres-operator.
So far all the versions are hardcoded to the latest release, and documentation
mention helm mostly for development purposes with minikube.
* Minor improvements
* Document empty list vs null for users without privileges
* Change the wording for null values
* Add talk by Oleksii in Atmosphere