问如何为golang添加受信任的证书

EN

KALEI-M-V11L:election kalei$ dep ensure
The following issues were found in Gopkg.toml:

  ✗ unable to deduce repository and source type for "k8s.io/apiextensions-apiserver": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://k8s.io/apiextensions-apiserver?go-get=1": Get https://k8s.io/apiextensions-apiserver?go-get=1: x509: certificate signed by unknown authority
  ✗ unable to deduce repository and source type for "k8s.io/apimachinery": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://k8s.io/apimachinery?go-get=1": Get https://k8s.io/apimachinery?go-get=1: x509: certificate signed by unknown authority
  ✗ unable to deduce repository and source type for "k8s.io/client-go": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://k8s.io/client-go?go-get=1": Get https://k8s.io/client-go?go-get=1: x509: certificate signed by unknown authority
  ✗ unable to deduce repository and source type for "sigs.k8s.io/controller-runtime": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://sigs.k8s.io/controller-runtime?go-get=1": Get https://sigs.k8s.io/controller-runtime?go-get=1: x509: certificate signed by unknown authority
  ✗ unable to deduce repository and source type for "k8s.io/code-generator": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://k8s.io/code-generator?go-get=1": Get https://k8s.io/code-generator?go-get=1: x509: certificate signed by unknown authority
  ✗ unable to deduce repository and source type for "k8s.io/api": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://k8s.io/api?go-get=1": Get https://k8s.io/api?go-get=1: x509: certificate signed by unknown authority