remove redis password env

compose.yml

@@ -108,7 +108,6 @@ services:
       - |
         echo "requirepass '$$REDIS_PASSWORD'" > /etc/redis.conf
         exec redis-server /etc/redis.conf
-    environment: REDIS_PASSWORD
     volumes:
       - "redis:/data:rw"
 
@@ -132,7 +131,6 @@ secrets:
     name: ${STACK_NAME}_zulip_secret_${SECRET_ZULIP_SECRET_VERSION}
     external: true
 
-
 configs:
   pg_backup:
     name: ${STACK_NAME}_pg_backup_${PG_BACKUP_VERSION}