✨ feat: adds support for custom ca.crt

[faiq]

What this PR does / why we need it:

This PR adds a field to the configuration secret called ca.crt this can be helpful if users are storing provider manifests in internal OCI registries.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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[k8s-ci-robot]

PR needs rebase.

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[alexander-demicev]

Hi, can you rebase?

[faiq]

yes absolutely, I think this code needs some extra TLC but I willl rebase

[alexander-demicev]

@faiq let me know when it's ready for review then