我正在尝试将php-imap安装到一个活动的Docker容器中，但我一直遇到问题
当尝试像这样使用libc-client进行操作时：
FROM quay.io/user/docker-php:7.3-prod
WORKDIR /docker_app
COPY ./ /docker_app
RUN set -ex && \
apt-get install -y libc-client-dev libkrb5-dev && \
docker-php-ext-configure imap --with-kerberos --with-imap-ssl && \
docker-php-ext-install imap
RUN set -ex && \
chmod -R a+w /docker_app/storage && \
cp /usr/local/etc/php/php.ini-production /usr/local/etc/php/php.ini && \
composer install --no-progress --no-dev --optimize-autoloader --no-scripts --no-interaction && \
php artisan clear-compiled && \
php artisan optimize && \
php artisan config:clear
到达debian时出现错误：
E: Failed to fetch http://deb.debian.org/debian/pool/main/e/e2fsprogs/comerr-dev_2.1-1.43.4-2_amd64.deb 404 Not Found
E: Failed to fetch http://security-cdn.debian.org/debian-security/pool/updates/main/o/openssl/libssl-dev_1.1.0j-1~deb9u1_amd64.deb 404 Not Found
E: Failed to fetch http://security-cdn.debian.org/debian-security/pool/updates/main/o/openssl/libssl-doc_1.1.0j-1~deb9u1_all.deb 404 Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?
但是，如果我删除它并只打了最后一个imap行，我就会得到：
checking for U8T_DECOMPOSE... configure: error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen. Check config.log for additional information.
显然这两种方式都存在冲突，但是如何在docker中的php7.3容器中正确添加php-imap？