Add TLS config options for notifiers using HTTP client

pkg/utl/http.go

@@ -0,0 +1,25 @@
+package utl
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"os"
+)
+
+func LoadTLSConfig(insecureSkipVerify bool, caCertFiles []string) (*tls.Config, error) {
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: insecureSkipVerify,
+	}
+	if len(caCertFiles) > 0 {
+		certPool := x509.NewCertPool()
+		for _, caCertFile := range caCertFiles {
+			caCert, err := os.ReadFile(caCertFile)
+			if err != nil {
+				return nil, err
+			}
+			certPool.AppendCertsFromPEM(caCert)
+		}
+		tlsConfig.RootCAs = certPool
+	}
+	return tlsConfig, nil
+}