minor fix

.env

@@ -88,6 +88,8 @@ ELASTICSEARCH_PORT=9200
 MERCURE_URL=xxx
 # The public URL of the Mercure hub, used by the browser to connect
 MERCURE_PUBLIC_URL=xxx
+# The secret key used to sign the JWTs => TODO: make it a secret
+MERCURE_PUBLISHER_JWT_KEY=xxx
 ###< symfony/mercure-bundle ###
 
 ###> typo3 client ###