Add new optional registry and digest Helm values

[erikgb]

Fixes #148

[jetstack-bot]

Hi @erikgb. 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[JoshVanL]

Cheers!
/lgtm
/approve
/ok-to-test

[jetstack-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: erikgb, JoshVanL

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[JoshVanL]

@erikgb looks like it needs a make helms doc update

[erikgb]

@JoshVanL Thanks, done now. I think I need to apply for a cert-manager org membership - to avoid waiting for the ok-test-label. PTAL

[inteon]

/lgtm