fix(telemetry): repair turn-off telemetry switch

Signed-off-by: Timofey Kirillov <timofey.kirillov@flant.com>

pkg/telemetry/telemetry.go

@@ -13,7 +13,8 @@ import (
 )
 
 const (
-	TracesURL = "https://telemetry.werf.io/v1/traces"
+	TracesURL    = "https://telemetry.werf.io/v1/traces"
+	TelemetryEnv = "WERF_TELEMETRY"
 )
 
 var (
@@ -94,9 +95,15 @@ func GetTraceUrl() string {
 }
 
 func IsEnabled() bool {
-	isDevVersion := werf.Version == "dev" || werf.Version == "0.0.0"
-	envVal := util.GetBoolEnvironmentDefaultFalse("WERF_TELEMETRY")
-	return envVal || !isDevVersion
+	val, isSet := util.LookupBoolEnvironment(TelemetryEnv)
+	if isSet && val != nil {
+		return *val
+	}
+
+	if werf.Version == "dev" || werf.Version == "0.0.0" {
+		return false
+	}
+	return true
 }
 
 func LogF(f string, args ...interface{}) {

pkg/util/env.go

@@ -8,17 +8,26 @@ import (
 	"strings"
 )
 
-func GetBoolEnvironment(environmentName string) *bool {
-	switch os.Getenv(environmentName) {
+func LookupBoolEnvironment(environmentName string) (*bool, bool) {
+	value, isSet := os.LookupEnv(environmentName)
+	if !isSet {
+		return nil, false
+	}
+
+	switch value {
 	case "1", "true", "yes":
 		t := true
-		return &t
+		return &t, true
 	case "0", "false", "no":
 		f := false
-		return &f
+		return &f, true
 	}
+	return nil, true
+}
 
-	return nil
+func GetBoolEnvironment(environmentName string) *bool {
+	val, _ := LookupBoolEnvironment(environmentName)
+	return val
 }
 
 func GetBoolEnvironmentDefaultFalse(environmentName string) bool {