Failed to create application due to error "x509: certificate signed by unknown authority"

[vuxuanlai]

Describe the bug

I completed add helm repo with cmd
argocd repo add https://<gitlab-enterprise>/charts/-/raw/master --type helm --name devops --username <username>--password <password> --insecure-skip-server-verification
But when I create application from these repo, I got the error that relating to authentication as title

To Reproduce
I failed to run command:
argocd app create alpha --insecure --repo https://<gitlab-enterprise>/charts/-/raw/master --helm-chart chart-backend --revision 1.1.1 --dest-namespace default --dest-server https://<k8s-controlplane-ip>:6443

and the error:

time="2021-06-02T14:55:34+07:00" level=fatal msg="rpc error: code = InvalidArgument desc = application spec is invalid: InvalidSpecError: Unable to get app details: rpc error: code = Unknown desc = `helm pull --destination /tmp/helm691938973 --version 1.1.1 --username ****** --password ****** --repo https://<gitlab-enterprise>/charts/-/raw/master chart-backend` failed exit status 1: Error: looks like \"https://<gitlab-enterprise>/charts/-/raw/master\" is not a valid chart repository or cannot be reached: Get \"https://<gitlab-enterprise>charts/-/raw/master/index.yaml\": x509: certificate signed by unknown authority"

Expected behavior

I want to create successfully application from helm repo

[jgwest]

Consistent with fix by #6458