Add imagePullSecrets to template

[mpsOxygen]

Hello,

This PR adds imagePullSecrets to default values.yaml and deployment.yaml.

[jetstack-bot]

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[jetstack-bot]

Hi @mpsOxygen. Thanks for your PR.

I'm waiting for a cert-manager member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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