今天，当我尝试使用alpine:edge构建容器时遇到错误
有我的Dockerfile：
FROM alpine:edge
RUN apk add --update --no-cache \
coreutils \
php7-fpm \
php7-apcu \
php7-ctype \
php7-curl \
php7-dom \
php7-gd \
php7-iconv \
php7-imagick \
php7-json \
php7-intl \
php7-mcrypt \
php7-fileinfo\
php7-mbstring \
php7-opcache \
php7-openssl \
php7-pdo \
php7-pdo_mysql \
php7-mysqli \
php7-pdo_pgsql \
php7-pgsql \
php7-xml \
php7-zlib \
php7-phar \
php7-tokenizer \
php7-session \
php7-simplexml \
php7-xdebug \
php7-zip \
php7-xmlwriter \
make \
curl \
zlib-dev \
libxml2-dev \
rabbitmq-c-dev \
oniguruma-dev \
php7-pecl-amqp \
php7-amqp \
php7-redis \
openrc --no-cache \
supervisor
RUN apk add --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing/ php7-pecl-mongodb
COPY docker-entrypoint.sh /opt/docker-entrypoint.sh
RUN echo "$(curl -sS https://composer.github.io/installer.sig) -" > composer-setup.php.sig \
&& curl -sS https://getcomposer.org/installer | tee composer-setup.php | sha384sum -c composer-setup.php.sig \
&& php composer-setup.php && rm composer-setup.php* \
&& chmod +x composer.phar && mv composer.phar /usr/bin/composer && chmod +x /opt/docker-entrypoint.sh
COPY symfony.ini /etc/php7/conf.d/
COPY symfony.ini /etc/php7/cli/conf.d/
COPY xdebug.ini /etc/php7/conf.d/
COPY symfony.pool.conf /etc/php7/php-fpm.d/
WORKDIR /var/www/symfony
ENTRYPOINT ["ash", "/opt/docker-entrypoint.sh"]
EXPOSE 9001
结束错误：
ERROR: unsatisfiable constraints:
so:libgdbm.so.4 (missing):
required by: python3-3.8.5-r1[so:libgdbm.so.4]
libsasl-2.1.27-r9[so:libgdbm.so.4]
当我添加此问题时，该问题得以解决，但是为什么今天我正好遇到错误？
FROM alpine:edge
LABEL maintainer="Vincent Composieux <vincent.composieux@gmail.com>"
RUN apk update && apk upgrade && \
apk add --update --no-cache --update-cache vips-dev fftw-dev build-base \
--repository https://alpine.global.ssl.fastly.net/alpine/v3.10/community/ \
--repository https://alpine.global.ssl.fastly.net/alpine/v3.10/main
RUN apk add --update --no-cache \
coreutils \