[Promtail] Chart does not grant initContainer capabilities

[mcavoyk]

Describe the bug
The PodSecurityPolicy included in the Promtail Helm chart does not grant the capabilities needed for running the privileged initContainer when the setting is enabled.

To Reproduce
Steps to reproduce the behavior:

1. Have a cluster with a baseline PodSecurityPolicy which prevents privileged pods.
2. Install promtail chart with initContainer enabled and PSP enabled. The daemonset is unable to create pods.

Expected behavior
Helm chart should have settings to grant the cabilities the chart requires to run.

Environment:

• Infrastructure: Kubernetes v1.16
• Deployment tool: Helm - Promtail chart v0.24.0

Screenshots, Promtail config, or terminal output

Warning  FailedCreate      18s (x11 over 23s)  daemonset-controller  Error creating: pods "promtail-" is forbidden: unable to validate against any pod security policy: [spec.initContainers[0].securityContext.privileged: Invalid value: true: Privileged containers are not allowed]