chart/values.yaml has outdated postgresql tag

Bug

Description

Release notes for Big Bang and CHANGELOG entries for mattermost claim that the internal postgresql were updated to 18 but the postgresql.image.tag in chart/values.yaml still has a tag version of "17.6". This is out of synch with the chart/Chart.yaml entry for needed images and causes problems in offline environments that may not have loaded the 17.6 image.

BigBang Version

Big Bang 3.17.0, mattermost 11.3.0-bb.2

Workaround

Override the postgresql image tag in the Big Bang configmap with

  mattermost:
    values:
      postgresql:
        image:
          tag: "18.1"