Added GitHub webhook functionality and configuration for API interaction

This commit introduces functionality for GitHub webhook interaction and API calls. The git operations are handled by a custom GitHub client in PHP, details for API endpoints are outlined in a new OpenAPI schema, and the project setup includes PHP FPM and NGINX configuration using Docker. A webhook receiver is also added to process incoming webhook payloads.

php-fpm/Dockerfile

@@ -0,0 +1,21 @@
+# Use the official PHP-FPM image for PHP 8.3
+FROM php:8.3-fpm
+
+# Set the working directory
+WORKDIR /var/www/html
+
+# Install Composer
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    zip \
+    unzip \
+    git \
+    && apt-get clean
+
+# Expose port 9000 for PHP-FPM
+EXPOSE 9000
+
+# Start PHP-FPM
+CMD ["php-fpm"]