I am trying to write a helm operator using client-go and want to fetch the chart from my controller using the RepoURL, and chartname. I have written a sample piece of code which is working perfectly fine on my local machine. But the same code throws error when I run the same code inside the container. Please find the following piece of code:

func FetchURL() error {
    repoURL := "https://kubernetes-charts.storage.googleapis.com"
    username := ""
    password := ""
    var settings environment.EnvSettings
    flags := pflag.NewFlagSet("helm-env", pflag.ContinueOnError)
    settings.AddFlags(flags)
    settings.Init(flags)
    getters := getter.All(settings)

    getters := getter.All(settings)

    var err error
    destDir, err := ioutil.TempDir("", "helm-")
    if err != nil {
        return fmt.Errorf("Failed to untar: %s", err)
    }
    defer os.RemoveAll(destDir)

    chartURL, err := repo.FindChartInAuthRepoURL(repoURL, username, password, chartRef, "", "", "", "", getter.All(settings))
    if err != nil {
        return fmt.Errorf("Error finding the Chart URL: %s", err)
    }
    fmt.Println(chartURL)
    return nil
}

The above function is throwing following error while getting the chartURL:

Fetching Chart
Error finding the Chart URL: Looks like "https://kubernetes-charts.storage.googleapis.com" is not a valid chart repository or cannot be reached: Get https://kubernetes-charts.storage.googleapis.com/index.yaml: x509: certificate signed by unknown authority

I get that it is asking for some ca certificate, but I am not sure which ca certificate as I have initialised helm without tls certificates.

I also tried to copy the helm binary inside the pod and tried to run:

helm init --client-only
helm repo update
Hang tight while we grab the latest from your chart repositories...
...Skip local chart repository
...Unable to get an update from the "stable" chart repository (https://kubernetes-charts.storage.googleapis.com):
    Get https://kubernetes-charts.storage.googleapis.com/index.yaml: x509: certificate signed by unknown authority
...Unable to get an update from the "bitnami" chart repository (https://charts.bitnami.com/bitnami):
    Get https://charts.bitnami.com/bitnami/index.yaml: x509: certificate signed by unknown authority
Update Complete.

I am facing the same issue there also. Has anyone faced similar issue?