Update Dockerfile

Dockerfile

@@ -9,9 +9,8 @@ RUN mkdir -p /var/cache/nginx \
              /var/log/nginx \
              /var/lib/nginx \
              /var/www/html \
-             /var/log/nginx/error.log \
              /usr/share/nginx/html
-RUN touch /var/run/nginx.pid
+RUN touch /var/run/nginx.pid && /var/log/nginx/error.log
 
 # Give permissions to 'pn' user for Nginx and static files directory
 RUN chown -R pn:pn /var/cache/nginx \