Make tlsconfig optional for op-signer client

op-signer/client/client.go

@@ -25,6 +25,9 @@ type SignerClient struct {
 }
 
 func NewSignerClient(logger log.Logger, endpoint string, tlsConfig optls.CLIConfig) (*SignerClient, error) {
+	var httpClient *http.Client
+	if tlsConfig.TLSCaCert != "" {
+		logger.Info("tlsConfig specified, loading tls config")
 		caCert, err := os.ReadFile(tlsConfig.TLSCaCert)
 		if err != nil {
 			return nil, fmt.Errorf("failed to read tls.ca: %w", err)
@@ -43,7 +46,7 @@ func NewSignerClient(logger log.Logger, endpoint string, tlsConfig optls.CLIConf
 			return nil, err
 		}
 
-	httpClient := &http.Client{
+		httpClient = &http.Client{
 			Transport: &http.Transport{
 				TLSClientConfig: &tls.Config{
 					MinVersion: tls.VersionTLS13,
@@ -54,6 +57,11 @@ func NewSignerClient(logger log.Logger, endpoint string, tlsConfig optls.CLIConf
 				},
 			},
 		}
+	} else {
+		logger.Info("no tlsConfig specified, using default http client")
+		httpClient = http.DefaultClient
+	}
+
 	rpcClient, err := rpc.DialOptions(context.Background(), endpoint, rpc.WithHTTPClient(httpClient))
 	if err != nil {
 		return nil, err