Add own CA Certificate to Gitlab-Toolbox Helm-Deployment


We have a Gitlab instance deployed with Helm in Kubernetes.

For backup purposes, there is a Minio server outside the Kubernetes cluster. This Minio server has a self-signed certificate.

What is the best way to add our CA certificate to the kubernetes helm deployment of the Gitlab toolbox?

I need our CA certificate in the container of the Gitlab toolbox which was installed with the helm chart.

Currently I have edited the toolbox-deployment by hand and copy the certificate to the right place.

This works so far. However, I have to adjust the deployment again after each update with Helm.

So I am wondering what is the right way to add the CA certificate to the container?