[Maintenance] Configuration warning: unknown environment variable "PMM_ADMIN_PASSWORD=[REDACTED]"

[albdv]

I'm running pmm-server via official helm chart from percona.
Accordingly to documentation I've set secret for PMM_ADMIN_PASSWORD, instead of setting a password I've got a message with a plain text password printing and message that environment variable is unknown

• What should be done:
  I think, that if password is not able to be set, app should die
  How env var PMM_ADMIN_PASSWORD could be unknown?

• Benefit:
  Better security I think

• Suggested implementation:
  No suggestion

• Details:
  If you need any additional details, let me know