[Productifiation] Set SESSION_SECURE_COOKIE=true in production (#435)

* Update .env.docker.example

* Update .env.example

Author: shleeable

.env.docker.example

@@ -85,6 +85,7 @@ SESSION_LIFETIME=86400
 SESSION_ENCRYPT=false
 SESSION_PATH=/
 SESSION_DOMAIN=null
+SESSION_SECURE_COOKIE=true
 
 LOG_CHANNEL=daily
 LOG_STACK=single

.env.example

@@ -34,6 +34,7 @@ SESSION_LIFETIME=86400
 SESSION_ENCRYPT=false
 SESSION_PATH=/
 SESSION_DOMAIN=null
+SESSION_SECURE_COOKIE=true
 
 BROADCAST_CONNECTION=log
 FILESYSTEM_DISK=local