PostgreSQL - Run the init non root

[megian]

Context

The current PostgreSQL init requires obviously special permissions to set the volume permissions. Check if this can be prevented by using Delegating volume permission and ownership change to CSI driver.

Alternatives

Keep it less secure as is

[megian]

The documentation still states that the volumePermission init container would be required. However the TLS key has also the right permission of 600without the volumePermission initcontainer.

$ ls -l /opt/bitnami/postgresql/certs/tls.key
-rw------- 1 1001 1001 3272 Jan  5 12:39 /opt/bitnami/postgresql/certs/tls.key
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