#387 Support imagePullSecrets in mattermost-enterprise-edition

[yeongeon]

Summary

imagePullSecrets needs in mattermost-enterprise-edition helm chart for more convenience as below.

    spec:
      container:
      ...
      {{- with .Values.mattermostApp.image.imagePullSecrets }}
      imagePullSecrets:
        {{- toYaml . | nindent 8 }}
      {{- end }}

thus it edited three parts of templates,

• deployment-mattermost-app.yaml
• deployment-mattermost-jobserver.yaml
• deployment-mattermost-loadtest.yaml

and it referred to the Kubernetes docs.

Ticket Link

Fixes #387

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