create php fpm docker file

docker/php/Dockerfile

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+# PHP-FPM runtime
+FROM php:8.5-rc-fpm-alpine3.23
+WORKDIR /var/www/html
+
+# Install any PHP extensions you need
+# RUN docker-php-ext-install pdo_mysql
+
+# Expose port 9000 (default for php-fpm)
+EXPOSE 9000