[ticket/13740] Exit from installation if phpBB is already installed

PHPBB3-13740

phpBB/config/installer/container/services_install_console.yml

@@ -21,6 +21,7 @@ services:
             - @language
             - @installer.helper.iohandler_factory
             - @installer.installer.install
+            - @installer.helper.install_helper
         tags:
             - { name: console.installer.command }
 

phpBB/config/installer/container/services_install_controller.yml

@@ -30,3 +30,4 @@ services:
             - @template
             - @request
             - @installer.installer.install
+            - @installer.helper.install_helper

phpBB/config/installer/container/services_installer.yml

@@ -56,6 +56,12 @@ services:
             - %core.root_path%
             - %core.php_ext%
 
+    installer.helper.install_helper:
+        class: phpbb\install\helper\install_helper
+        arguments:
+            - %core.root_path%
+            - %core.php_ext%
+
 # -------- Installer --------------------------------
     installer.module_base:
         abstract: true