docker/roundcube/Dockerfile

FROM roundcube/roundcubemail:1.6.6-apache

RUN a2enmod remoteip; \
    echo "RemoteIPHeader X-Forwarded-For" > /etc/apache2/conf-available/remoteip.conf; \
    a2enconf remoteip; \
    sed -i -r 's/^ServerTokens .*/ServerTokens Prod/g' /etc/apache2/conf-available/security.conf; \
    sed -i -r 's/^ServerSignature .*/ServerSignature Off/g' /etc/apache2/conf-available/security.conf; \
    sed -i -E 's/^LogFormat "%h(.*)/LogFormat "%a\1/g' /etc/apache2/apache2.conf; \
    echo "expose_php = Off" > /usr/local/etc/php/conf.d/php_version.ini;

RUN set -ex; \
    apt-get update; \
    apt-get install -y --no-install-recommends \
        git \
    ; \
    \
    composer \
        --working-dir=/usr/src/roundcubemail/ \
        --prefer-dist \
        --prefer-stable \
        --update-no-dev \
        --no-interaction \
        --optimize-autoloader \
        --apcu-autoloader \
        require \
            roundcube/carddav \
    ;

RUN mkdir -p /etc/enigma/gnupg \
 && chown www-data:www-data /etc/enigma/gnupg \
 && cp /usr/src/roundcubemail/plugins/enigma/config.inc.php.dist /usr/src/roundcubemail/plugins/enigma/config.inc.php \
 && echo "\$config['enigma_pgp_homedir'] = '/etc/enigma/gnupg';" >> /usr/src/roundcubemail/plugins/enigma/config.inc.php