[#139] Add root ca cert for telemetry configuration

Signed-off-by: Aleksey Savaitan <a.savaitan@yadro.com>

cmd/http-gw/app.go

@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"context"
+	"crypto/x509"
 	"errors"
 	"fmt"
 	"net/http"
@@ -737,6 +738,22 @@ func (a *app) initTracing(ctx context.Context) {
 		InstanceID: instanceID,
 		Version:    Version,
 	}
+
+	if trustedCa := a.cfg.GetString(cfgTracingTrustedCa); trustedCa != "" {
+		caBytes, err := os.ReadFile(trustedCa)
+		if err != nil {
+			a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err))
+			return
+		}
+		certPool := x509.NewCertPool()
+		ok := certPool.AppendCertsFromPEM(caBytes)
+		if !ok {
+			a.log.Warn(logs.FailedToInitializeTracing, zap.String("error", "can't fill cert pool by ca cert"))
+			return
+		}
+		cfg.ServerCaCertPool = certPool
+	}
+
 	updated, err := tracing.Setup(ctx, cfg)
 	if err != nil {
 		a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err))