Hey OddShrimp85 - You can tweak the following section in the clearml-agent override values:

# -- Global parameters section
global:
  # -- Images registry
  imageRegistry: "docker.io"

# -- Private image registry configuration
imageCredentials:
  # -- Use private authentication mode
  enabled: true # <-- Set this to true
  # -- Registry name
  registry: docker.io
  # -- Registry username
  username: someone
  # -- Registry password
  password: pwd
  # -- Email
  email: someone@host.com