Dockerfile example of replacing alpine's php7-memcached package with one compiled from source

Dockerfile

FROM alpine:edge
# Using this RUN line in place of where I normally would apk add php7-memcached
RUN echo '@community http://nl.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories && \
    apk update && \
  # Add packages and build dependencies
    apk add --no-cache tar sed grep curl wget gzip pcre ca-certificates \
                       build-base zlib-dev autoconf libmemcached-dev \
                       php7@community php7-dev@community php7-session@community && \
  # Fetch the php7-memcached source and build/install/cleanup
    curl -o php7-memcached.tar.gz -SL https://github.com/php-memcached-dev/php-memcached/archive/php7.tar.gz && \
    tar -xzf php7-memcached.tar.gz && \
    cd php-memcached-php7 && \
    phpize7 && \
    ./configure --prefix=/usr --disable-memcached-sasl --with-php-config=php-config7 && \
    make && \
    make install && \
    install -d /etc/php7/conf.d && \
    echo "extension=memcached.so" > /etc/php7/conf.d/20_memcached.ini && \
    cd .. && \
    rm -rf php7-memcached.tar.gz && \
    rm -rf php-memcached-php7 && \
  # prune the build deps for php7-memcached.
    apk del build-base zlib-dev autoconf libmemcached-dev php7-dev