Start webserver for 2.3 builds

Author: michielgerritsen

magento/Dockerfile-2.3

@@ -66,6 +66,7 @@ RUN ./start-services && \
     rm scripts/install-phpstan.php && \
     ./stop-services
 
+COPY templates/supervisord-webserver.conf /etc/supervisor/conf.d/webserver.conf
 COPY patches/cors.patch cors.patch
 COPY templates/install-config-mysql.php dev/tests/integration/etc/
 COPY templates/post-install-setup-command-config.php dev/tests/integration/etc/