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.

nginx/nginx.conf

@@ -0,0 +1,36 @@
+server {
+    listen 80;
+    server_name ${VIRTUAL_HOST};
+
+    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss;
+
+    location / {
+        proxy_read_timeout 7200;
+        proxy_connect_timeout 7200;
+        if (!-e $request_filename){
+            rewrite ^(.*)$ / break;
+        }
+        root /usr/share/nginx/html;
+        index index.php;
+    }
+
+    location ~ \.php$ {
+        root /var/www/html;
+        fastcgi_pass php-fpm:9000;
+        fastcgi_param SCRIPT_FILENAME /var/www/html$fastcgi_script_name;
+        include fastcgi_params;
+        fastcgi_buffers 16 32k;
+        fastcgi_buffer_size 64k;
+        fastcgi_busy_buffers_size 64k;
+        fastcgi_read_timeout 900;
+    }
+
+    error_page 500 502 503 504 /50x.html;
+    location = /50x.html {
+        root /usr/share/nginx/html;
+    }
+
+    location ~ /\.ht {
+        deny all;
+    }
+}