message: auth: use proxy from environment when connecting to OAuth server
diff: @@ -151,6 +151,7 @@ func newHTTPClient(issuerCA string, includeSystemRoots bool) (*http.Client, erro
  httpClient := &http.Client{
  Transport: &http.Transport{
  + Proxy: http.ProxyFromEnvironment,
  TLSClientConfig: &tls.Config{
  RootCAs: certPool,
  },
  