Fix 0 httpTimeout for logger webhook (#20653)

Previously, not setting http.Config.HTTPTimeout for logger webhook
was resulting in a timeout of 0, and causing "deadline exceeded"
errors in log webhook.

This change introduces a new env variable for configuring log webhook
timeout and more importantly sets it when the config is initialised.

internal/logger/config.go

@@ -79,6 +79,7 @@ const (
 	EnvLoggerWebhookQueueDir      = "MINIO_LOGGER_WEBHOOK_QUEUE_DIR"
 	EnvLoggerWebhookMaxRetry      = "MINIO_LOGGER_WEBHOOK_MAX_RETRY"
 	EnvLoggerWebhookRetryInterval = "MINIO_LOGGER_WEBHOOK_RETRY_INTERVAL"
+	EnvLoggerWebhookHTTPTimeout   = "MINIO_LOGGER_WEBHOOK_HTTP_TIMEOUT"
 
 	EnvAuditWebhookEnable        = "MINIO_AUDIT_WEBHOOK_ENABLE"
 	EnvAuditWebhookEndpoint      = "MINIO_AUDIT_WEBHOOK_ENDPOINT"
@@ -507,7 +508,18 @@ func lookupLoggerWebhookConfig(scfg config.Config, cfg Config) (Config, error) {
 		if retryInterval > time.Minute {
 			return cfg, fmt.Errorf("maximum allowed value for retry interval is '1m': %s", retryIntervalCfgVal)
 		}
+
+		httpTimeoutCfgVal := getCfgVal(EnvLoggerWebhookHTTPTimeout, k, kv.Get(httpTimeout))
+		httpTimeout, err := time.ParseDuration(httpTimeoutCfgVal)
+		if err != nil {
+			return cfg, err
+		}
+		if httpTimeout < time.Second {
+			return cfg, fmt.Errorf("minimum value allowed for http_timeout is '1s': %s", httpTimeout)
+		}
+
 		cfg.HTTP[k] = http.Config{
+			HTTPTimeout: httpTimeout,
 			Enabled:     true,
 			Endpoint:    url,
 			AuthToken:   getCfgVal(EnvLoggerWebhookAuthToken, k, kv.Get(AuthToken)),