Update Dockerfile

Dockerfile

@@ -9,6 +9,7 @@ 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
 
@@ -18,6 +19,7 @@ RUN chown -R pn:pn /var/cache/nginx \
                    /var/lib/nginx \
                    /var/run/nginx.pid \
                    /var/www/html \
+                   /var/log/nginx/error.log \
                    /usr/share/nginx/html
 
 # Switch back to the 'pn' user for installing dependencies and building the app