[helm] Add global.imagePullSecrets

[jkroepke]

Description

This PR add the possibility to set imagePullSecrets via global variable scope.

This pattern is used in cert-manager, grafana and prometheus-community as well.

Fixes #ISSUE

Checklist

• Unit tests updated
• End user documentation updated

[k8s-ci-robot]

Hi @jkroepke. Thanks for your PR.

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[mloiseleur]

/assign @stevehipwell

[stevehipwell]

Thanks for the PR @jkroepke. Could you also add an any type for global to the JSON schema to cover this support of global in this chart.

[jkroepke]

Done

[stevehipwell]

Thanks @jkroepke could you also run helm-docs and add a CHANGELOG entry so I can run the CI.

[jkroepke]

Sorry, thanks and done!

[stevehipwell]

/ok-to-test

[stevehipwell]

/lgtm
/approve

[k8s-ci-robot]

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This pull-request has been approved by: stevehipwell

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