Fix Docker quickstart on homepage: missing intl, wrong bin/cake invocation, missing pdo_mysql

docs/en/index.md

@@ -58,13 +58,20 @@ ddev launch
 ```
 
 ```bash [Docker]
-# Using official PHP image
-docker run -it --rm -v $(pwd):/app composer create-project \
-  --prefer-dist cakephp/app:~|cakeversion| my_app
-
+# CakePHP requires the intl extension, which the official composer image
+# does not provide, so Composer is run inside a PHP image with intl installed
+docker run --rm -v $(pwd):/app -w /app php:8.2-cli bash -c \
+  "apt-get update && apt-get install -y libicu-dev git unzip curl \
+  && docker-php-ext-install intl \
+  && curl -sS https://getcomposer.org/installer | php \
+  && php composer.phar create-project --prefer-dist cakephp/app:~|cakeversion| my_app"
+
+# Start development server (install required extensions first)
 cd my_app
-docker run -it --rm -p 8765:8765 -v $(pwd):/app \
-  -w /app php:8.2-cli php bin/cake server -H 0.0.0.0
+docker run -it --rm -p 8765:8765 -v $(pwd):/app -w /app php:8.2-cli \
+  bash -c "apt-get update && apt-get install -y libicu-dev \
+  && docker-php-ext-install intl pdo_mysql \
+  && php bin/cake.php server -H 0.0.0.0"
 ```
 
 :::