Adding docker for deployment

Dockerfile

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+FROM php:8.2-apache
+
+# Enable mod_rewrite for clean URLs and .htaccess support
+RUN a2enmod rewrite
+
+# Install PHP extensions needed: mysqli (sig-03), pdo + pdo_mysql (sig-01, sig-02)
+RUN docker-php-ext-install mysqli pdo pdo_mysql
+
+# Allow .htaccess overrides in /var/www/html
+RUN sed -i 's/AllowOverride None/AllowOverride All/g' /etc/apache2/apache2.conf
+
+# Copy all project files into Apache web root
+COPY . /var/www/html/
+
+# Fix file permissions
+RUN chown -R www-data:www-data /var/www/html \
+    && chmod -R 755 /var/www/html