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Backup job failing with No such file or directory @ rb_sysopen - /etc/gitlab/objectstorage/pages

Summary

Since !1677 (merged), backup job fails with error /usr/lib/ruby/2.7.0/psych.rb:577:in initialize': No such file or directory @ rb_sysopen - /etc/gitlab/objectstorage/pages (Errno::ENOENT)`.

tl:dr : I think this issue is link to the discrepancy between https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/charts/gitlab/charts/task-runner/templates/backup-job.yaml and https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/charts/gitlab/charts/task-runner/templates/deployment.yaml :

`{{- include "gitlab.pages.mountSecrets" $ | nindent 10 }}`

and

`{{- include "gitlab.appConfig.objectStorage.mountSecrets" (dict "name" "pages" "config" $.Values.global.pages.objectStore) | nindent 10 }}`

are missing from the backup-job configuration.

Steps to reproduce

Install the gitlab chart at current (master) version (bug has been merged after 3.7.1 release) with a valid pages configuration and a valid backup cronjob configuration (e.g with mine) :

gitlab:
    ## doc/charts/gitlab/task-runner
    task-runner:
      enabled: true
      replicas: 1
      backups:
        cron:
          enabled: true
          concurrencyPolicy: Replace
          resources:
            requests:
              cpu: "50m"
              memory: "350M"
          schedule: "0 2 * * *"
        objectStorage:
          backend: "s3"
          config:
            secret: s3-minio
            key: connection
      resources:
        requests:
          cpu: "200m"
          memory: "500M"
      securityContext:
        fsGroup: "1000"
        runAsUser: "1000"

Current behavior

Cronjob pods fail at startup with error :

/usr/lib/ruby/2.7.0/psych.rb:577:in `initialize': No such file or directory @ rb_sysopen - /etc/gitlab/objectstorage/pages (Errno::ENOENT)
	from /usr/lib/ruby/2.7.0/psych.rb:577:in `open'
	from /usr/lib/ruby/2.7.0/psych.rb:577:in `load_file'
	from (erb):108:in `<main>'
	from /usr/lib/ruby/2.7.0/erb.rb:905:in `eval'
	from /usr/lib/ruby/2.7.0/erb.rb:905:in `result'
	from /scripts/set-config:22:in `block in <main>'
	from /scripts/set-config:18:in `each'
	from /scripts/set-config:18:in `<main>'
Begin parsing .erb files from /var/opt/gitlab/templates
Writing /srv/gitlab/config/database.yml
Writing /srv/gitlab/config/cable.yml
Writing /srv/gitlab/config/resque.yml
Writing /srv/gitlab/config/gitlab.yml

Manually running the backup from within the permanent task runner pod works fine.

Expected behavior

Cronjob should work the same way as the permanent task-runner pod. Pages configuration should be injected in both.

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