Fix auth modes enabled by config file

Enable auth modes based on CLI options, but do not force auth modes
selected by the config file if not enabled by the CLI options

main.go

@@ -65,8 +65,12 @@ func main() {
 
 		utils.ApplyFlags(cliFlags, flagMappings, c, appOptions, backendOptions)
 
-		appOptions.EnableBasicAuth = c.IsSet("credential")
+		if c.IsSet("credential") {
-		appOptions.EnableTLSClientAuth = c.IsSet("tls-ca-crt")
+			appOptions.EnableBasicAuth = true
+		}
+		if c.IsSet("tls-ca-crt") {
+			appOptions.EnableTLSClientAuth = true
+		}
 
 		err = appOptions.Validate()
 		if err != nil {