Consolidate Build Configs talk slides

src/building-build-configs/sections/customisation.rst

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+.. raw:: pdf
+
+   PageBreak standardPage
+
+Overriding Values
+=================
+
+.. code-block:: yaml
+
+   php:
+     version: 8.1-fpm-bullseye
+     # Disable PHPCS, PHPStan and PHPUnit.
+     phpcs: false
+     phpstan: false
+     phpunit: false
+
+   # Ignore more directories from Git.
+   git:
+     ignore:
+       - /bin/
+       - /libraries/
+       - /web/profiles/contrib/
+
+.. raw:: pdf
+
+   TextAnnotation "Drupal Commerce Kickstart demo. No custom modules to test, and additional paths to ignore from Git."
+
+   PageBreak
+
+.. code-block:: yaml
+
+   dockerfile:
+     stages:
+       build:
+         # What additional directories do we need?
+         extra_directories:
+           - config
+           - patches
+           - scripts
+
+         commands:
+           - composer validate --strict
+           - composer install
+
+         # What additional PHP extensions do we need?
+         extensions:
+           install: [bcmath]
+
+.. raw:: pdf
+
+   TextAnnotation "Extra directories and PHP extensions that need to be added".
+