Added redis session cache + sf session ttl 30d.

Procfile

@@ -1 +1 @@
-web: heroku-php-apache2 public/
+web: vendor/bin/heroku-php-apache2 public/

composer.json

@@ -5,6 +5,7 @@
         "php": "^7.1.3",
         "ext-ctype": "*",
         "ext-iconv": "*",
+        "ext-redis": "*",
         "knpuniversity/oauth2-client-bundle": "^1.32",
         "league/oauth2-google": "^3.0",
         "predis/predis": "^1.1",

config/packages/framework.yaml

@@ -6,9 +6,13 @@ framework:
     # Enables session support. Note that the session will ONLY be started if you read or write from it.
     # Remove or comment this section to explicitly disable session support.
     session:
+        enabled: true
         handler_id: Symfony\Component\HttpFoundation\Session\Storage\Handler\RedisSessionHandler
         cookie_secure: auto
         cookie_samesite: lax
+        cookie_lifetime: 2592000 # 30days
+        gc_maxlifetime: 2592000
+        gc_probability: 0
 
     #esi: true
     #fragments: true

public/.user.ini

@@ -0,0 +1,4 @@
+session.save_handler=redis
+session.save_path="${SESSION_REDIS_URL}"
+session.cache_expire=0
+session.gc_probability=0