Merge pull request #1513 from fluxcd/backport-1490-to-release/v1.3.x

[release/v1.3.x] helm: Use the default transport pool to preserve proxy settings

internal/helm/registry/client.go

@@ -69,10 +69,10 @@ func newClient(credentialsFile string, tlsConfig *tls.Config, insecureHTTP bool)
 		opts = append(opts, registry.ClientOptPlainHTTP())
 	}
 	if tlsConfig != nil {
+		t := http.DefaultTransport.(*http.Transport).Clone()
+		t.TLSClientConfig = tlsConfig
 		opts = append(opts, registry.ClientOptHTTPClient(&http.Client{
-			Transport: &http.Transport{
-				TLSClientConfig: tlsConfig,
-			},
+			Transport: t,
 		}))
 	}
 	if credentialsFile != "" {