updated dockerfile

Dockerfile

@@ -4,6 +4,10 @@ RUN apt-get update && apt-get install -y nginx
 
 COPY index.html /usr/share/nginx/html/index.html
 
+RUN sed -i 's|root /var/www/html;|root /usr/share/nginx/html;|' /etc/nginx/sites-available/default && \
+    nginx -t && \
+    nginx -s reload
+
 EXPOSE 80
 
 CMD ["nginx", "-g", "daemon off;"]