在 Docker 中，如何在启动容器时守护 Hyperf 进程呢？

在 Docker 中，如何守护 Hyperf 进程呢？
Dockerfile 参考官方的修改

# Default Dockerfile
#
# @link     https://www.hyperf.io
# @document https://doc.hyperf.io
# @contact  group@hyperf.io
# @license  https://github.com/hyperf-cloud/hyperf/blob/master/LICENSE

FROM hyperf/hyperf:latest
LABEL maintainer="Hyperf Developers <group@hyperf.io>" version="1.0" license="MIT"

##
# ---------- env settings ----------
##
# --build-arg timezone=Asia/Shanghai
ARG SWOOLE_VERSION
ARG timezone

ENV SWOOLE_VERSION=${SWOOLE_VERSION:-"4.4.12"} \
    TIMEZONE=${timezone:-"Asia/Shanghai"} \
    COMPOSER_VERSION=1.8.6 \
    #  install and remove building packages
    PHPIZE_DEPS="autoconf dpkg-dev dpkg file g++ gcc libc-dev make php7-dev php7-pear pkgconf re2c pcre-dev zlib-dev libtool automake" \
    APP_ENV=prod

# update
RUN set -ex \
    && apk update \
    # for swoole extension libaio linux-headers
    && apk add --no-cache libstdc++ openssl git bash \
    && apk add --no-cache --virtual .build-deps $PHPIZE_DEPS libaio-dev openssl-dev \
    # download
    && cd /tmp \
    && curl -SL "https://github.com/swoole/swoole-src/archive/v${SWOOLE_VERSION}.tar.gz" -o swoole.tar.gz \
    && ls -alh \
    # php extension:swoole
    && cd /tmp \
    && mkdir -p swoole \
    && tar -xf swoole.tar.gz -C swoole --strip-components=1 \
    && ( \
        cd swoole \
        && phpize \
        && ./configure --enable-mysqlnd --enable-openssl \
        && make -s -j$(nproc) && make install \
    ) \
    && echo "extension=swoole.so" > /etc/php7/conf.d/swoole.ini \
    && echo "swoole.use_shortname = 'Off'" >> /etc/php7/conf.d/swoole.ini \
    # install composer
    && cd /tmp \
    && wget https://github.com/composer/composer/releases/download/${COMPOSER_VERSION}/composer.phar \
    && chmod u+x composer.phar \
    && mv composer.phar /usr/local/bin/composer \
    # show php version and extensions
    && php -v \
    && php -m \
    && php --ri swoole \
    #  ---------- some config ----------
    && cd /etc/php7 \
    # - config PHP
    && { \
        echo "upload_max_filesize=100M"; \
        echo "post_max_size=108M"; \
        echo "memory_limit=1024M"; \
        echo "date.timezone=${TIMEZONE}"; \
    } | tee conf.d/99-overrides.ini \
    # - config timezone
    && ln -sf /usr/share/zoneinfo/${TIMEZONE} /etc/localtime \
    && echo "${TIMEZONE}" > /etc/timezone \
    # ---------- clear works ----------
    && apk del .build-deps \
    && rm -rf /var/cache/apk/* /tmp/* /usr/share/man \
    && echo -e "\033[42;37m Build Completed :).\033[0m\n"

COPY . /opt/www

WORKDIR /opt/www

RUN composer install --no-dev -o \
    && php /opt/www/bin/hyperf.php di:init-proxy

EXPOSE 9501

ENTRYPOINT ["php", "/opt/www/bin/hyperf.php", "start"]

构建镜像
docker build -t hyperf/hyperf:7.2 .
执行
docker run -itd --name=hyperf7.2 -v /tmp/skeleton:/opt/www -p 9501:9501 hyperf/hyperf
容器正常运行，但是端口9501 仍然无法访问？（进入容器 启动 php /opt/www/bin/hyperf.php start 后9501可访问）
到底如何守护hyperf在容器后台运行呢?
搞了2天还是没搞懂，懵~~· 难道是方向搞错了麽？