support goproxy for list/download command (#1304)

pkg/config/config_test.go

@@ -71,6 +71,7 @@ func TestEnvOverrides(t *testing.T) {
 		ProtocolWorkers: 10,
 		LogLevel:        "info",
 		GoBinary:        "go11",
+		GoProxy:         "direct",
 		CloudRuntime:    "gcp",
 		TimeoutConf: TimeoutConf{
 			Timeout: 30,
@@ -249,6 +250,7 @@ func TestParseExampleConfig(t *testing.T) {
 		GoEnv:           "development",
 		LogLevel:        "debug",
 		GoBinary:        "go",
+		GoProxy:         "direct",
 		GoGetWorkers:    10,
 		ProtocolWorkers: 30,
 		CloudRuntime:    "none",
@@ -291,6 +293,7 @@ func getEnvMap(config *Config) map[string]string {
 	envVars := map[string]string{
 		"GO_ENV":                  config.GoEnv,
 		"GO_BINARY_PATH":          config.GoBinary,
+		"GOPROXY":                 config.GoProxy,
 		"ATHENS_GOGET_WORKERS":    strconv.Itoa(config.GoGetWorkers),
 		"ATHENS_PROTOCOL_WORKERS": strconv.Itoa(config.ProtocolWorkers),
 		"ATHENS_LOG_LEVEL":        config.LogLevel,