Helm Chart: support log level configuration

What does this MR do?

Helm Chart: support log level configuration

Supports setting the log level in the Helm Chart.

References:

• https://sdk.operatorframework.io/docs/building-operators/golang/references/logging/
• https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/log/zap#Options.BindFlags

Changelog: added

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated (values file contains references)
• Tests added (we don't have a test setup for Charts configuration at this time)
• Integration tests added to GitLab QA (QA doesn't test this aspect of the application, as it's just the logs from the Operator)
• Equivalent MR/issue for omnibus-gitlab opened (this change is Operator-specific)
• Validate potential values for new configuration settings. Formats such as integer 10, duration 10s, URI scheme://user:passwd@host:port may require quotation or other special handling when rendered in a template and written to a configuration file.

Test plan

Test with a valid value

$ helm template myoperator deploy/chart --set manager.log.level=debug --show-only templates/manager/deployment.yaml | yq '.spec.template.spec.containers[0].args'
- --metrics-addr=127.0.0.1:8080
- --enable-leader-election
- --zap-devel=false
- --zap-log-level=debug

Test with another value

$ helm template myoperator deploy/chart --set manager.log.level=info --show-only templates/manager/deployment.yaml | yq '.spec.template.spec.containers[0].args'
- --metrics-addr=127.0.0.1:8080
- --enable-leader-election
- --zap-devel=false
- --zap-log-level=info

Test with defaults

$ helm template myoperator deploy/chart --show-only templates/manager/deployment.yaml | yq '.spec.template.spec.containers[0].args'
- --metrics-addr=127.0.0.1:8080
- --enable-leader-election
- --zap-devel=false
- --zap-log-level=info

Related issues

Related to https://gitlab.com/groups/gitlab-org/cloud-native/-/epics/66