install symfony demo with installer

app/config/packages/prod/deprecations.yaml

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+# As of Symfony 5.1, deprecations are logged in the dedicated "deprecation" channel when it exists
+#monolog:
+#    channels: [deprecation]
+#    handlers:
+#        deprecation:
+#            type: stream
+#            channels: [deprecation]
+#            path: "%kernel.logs_dir%/%kernel.environment%.deprecations.log"

app/config/packages/prod/doctrine.yaml

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+doctrine:
+    orm:
+        auto_generate_proxy_classes: false
+        metadata_cache_driver:
+            type: pool
+            pool: doctrine.system_cache_pool
+        query_cache_driver:
+            type: pool
+            pool: doctrine.system_cache_pool
+        result_cache_driver:
+            type: pool
+            pool: doctrine.result_cache_pool
+
+framework:
+    cache:
+        pools:
+            doctrine.result_cache_pool:
+                adapter: cache.app
+            doctrine.system_cache_pool:
+                adapter: cache.system

app/config/packages/prod/monolog.yaml

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+monolog:
+    handlers:
+        main:
+            type: fingers_crossed
+            action_level: error
+            handler: nested
+            excluded_http_codes: [404, 405]
+            buffer_size: 50 # How many messages should be saved? Prevent memory leaks
+        nested:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.log"
+            level: debug
+        console:
+            type: console
+            process_psr_3_messages: false
+            channels: ["!event", "!doctrine"]

app/config/packages/prod/routing.yaml

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+framework:
+    router:
+        strict_requirements: null

app/config/packages/prod/webpack_encore.yaml

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+#webpack_encore:
+    # Cache the entrypoints.json (rebuild Symfony's cache when entrypoints.json changes)
+    # Available in version 1.2
+    #cache: true