(buildkitd) feature request: ability to add onprem certs via helm chart

[lknite]

According to this article:
https://medium.com/@santimar/using-buildkit-to-build-docker-images-with-unprivileged-gitlab-runner-on-kubernetes-bd536e768c2f

Another great reason to use this kind of building infrastructure is that you can load you own root CA on BuildKit and make it push the image on your internal registry.

I'd like to push to an internal registry, how might I go about adding a ca-bundle via the helm chart?

[desaintmartin]

Sorry, I answer only now. PR accepted if it helps setting a CA!