Added an environment for the demo

In this environment the exception are logged to stderr, so we can access it via heroku.

.env

@@ -14,7 +14,7 @@
 # https://symfony.com/doc/current/best_practices/configuration.html#infrastructure-related-configuration
 
 ###> symfony/framework-bundle ###
-APP_ENV=dev
+APP_ENV=prod
 APP_SECRET=7915fd8481d1a52cf42010ebe2caa974
 #TRUSTED_PROXIES=127.0.0.1,127.0.0.2
 #TRUSTED_HOSTS='^localhost|example\.com$'

config/packages/demo/doctrine.yaml

@@ -0,0 +1,32 @@
+doctrine:
+    orm:
+        auto_generate_proxy_classes: false
+        metadata_cache_driver:
+            type: service
+            id: doctrine.system_cache_provider
+        query_cache_driver:
+            type: service
+            id: doctrine.system_cache_provider
+        result_cache_driver:
+            type: service
+            id: doctrine.result_cache_provider
+
+services:
+    doctrine.result_cache_provider:
+        class: Symfony\Component\Cache\DoctrineProvider
+        public: false
+        arguments:
+            - '@doctrine.result_cache_pool'
+    doctrine.system_cache_provider:
+        class: Symfony\Component\Cache\DoctrineProvider
+        public: false
+        arguments:
+            - '@doctrine.system_cache_pool'
+
+framework:
+    cache:
+        pools:
+            doctrine.result_cache_pool:
+                adapter: cache.app
+            doctrine.system_cache_pool:
+                adapter: cache.system

config/packages/demo/monolog.yaml

@@ -0,0 +1,23 @@
+monolog:
+    handlers:
+        main:
+            type: fingers_crossed
+            action_level: error
+            handler: nested
+            excluded_http_codes: [404, 405]
+        nested:
+            type: stream
+            path: "php://stderr"
+            level: debug
+        console:
+            type: console
+            process_psr_3_messages: false
+            channels: ["!event", "!doctrine"]
+        deprecation:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.deprecations.log"
+        deprecation_filter:
+            type: filter
+            handler: deprecation
+            max_level: info
+            channels: ["php"]