Docker Support: Added Dockerfile, updated DB connection for ENVs, and documented Docker usage in README

Dockerfile

@@ -1,4 +1,23 @@
 FROM php:8.2-apache
-RUN docker-php-ext-install mysqli && docker-php-ext-enable mysqli
-# Enable mod_rewrite for cleaner URLs if needed, though not strictly requested, it's good practice.
+
+# Install dependencies
+RUN apt-get update && apt-get install -y \
+    libpng-dev \
+    libjpeg-dev \
+    libfreetype6-dev \
+    && docker-php-ext-configure gd --with-freetype --with-jpeg \
+    && docker-php-ext-install -j$(nproc) gd mysqli
+
+# Enable Apache rewrite module
 RUN a2enmod rewrite
+
+# Copy application source
+COPY . /var/www/html/
+
+# Set permissions for upload directory
+RUN mkdir -p /var/www/html/uploads/images && \
+    chown -R www-data:www-data /var/www/html/uploads && \
+    chmod -R 755 /var/www/html/uploads
+
+# Expose port 80
+EXPOSE 80