Fix #2117. Gpg-agent package was missing for roundcube image.

(cherry picked from commit b248026933)

# Conflicts:
#	webmails/roundcube/Dockerfile

towncrier/newsfragments/2117.bugfix

@@ -0,0 +1,3 @@
+The gpg-agent package was missing due to updating to a new debian version.
+This fix adds gpg-agent back to the roundcube image.
+It is used for the enigmail roundcube plugin.

webmails/roundcube/Dockerfile

@@ -0,0 +1,78 @@
+# NOTE: only add qemu-arm-static if building for arm
+ARG ARCH=""
+ARG QEMU=other
+FROM ${ARCH}php:8.0-apache as build_arm
+ONBUILD COPY --from=balenalib/rpi-alpine:3.14 /usr/bin/qemu-arm-static /usr/bin/qemu-arm-static
+FROM ${ARCH}php:8.0-apache as build_other
+
+
+FROM build_${QEMU}
+ARG VERSION
+ENV TZ Etc/UTC
+
+LABEL version=$VERSION
+
+RUN set -eu \
+ && apt update \
+ && echo 'debconf debconf/frontend select Noninteractive' | debconf-set-selections \
+ && apt install -y --no-install-recommends \
+      python3 curl python3-pip git python3-multidict \
+      python3-jinja2 gpg gpg-agent tzdata \
+ && pip3 install socrate \
+ && echo date.timezone=UTC > /usr/local/etc/php/conf.d/timezone.ini \
+ && echo "ServerSignature Off\nServerName roundcube" >> /etc/apache2/apache2.conf \
+ && sed -i 's,CustomLog.*combined$,\0 "'"expr=!(%{HTTP_USER_AGENT}=='health'\&\&(-R '127.0.0.1/8' || -R '::1'))"'",' /etc/apache2/sites-available/000-default.conf \
+\
+ && mark="$(apt-mark showmanual)" \
+ && apt install -y --no-install-recommends \
+      libfreetype6-dev libicu-dev libjpeg62-turbo-dev libldap2-dev libmagickwand-dev \
+      libpng-dev libpq-dev libsqlite3-dev libzip-dev libpspell-dev libonig-dev \
+ && ln -s php.ini-production /usr/local/etc/php/php.ini \
+ && docker-php-ext-configure gd --with-jpeg --with-freetype \
+ && docker-php-ext-install exif gd intl zip pspell pdo_mysql pdo_pgsql pdo_sqlite \
+ && pecl install imagick \
+ && docker-php-ext-enable imagick opcache \
+ && apt-mark auto '.*' >/dev/null \
+ && apt-mark manual ${mark} >/dev/null \
+ && ldd "$(php -r 'echo ini_get("extension_dir");')"/*.so | awk '/=>/ { print $3 }' | sort -u | \
+    xargs -r dpkg-query -S | cut -d: -f1 | sort -u | xargs -r apt-mark manual >/dev/null \
+ && apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false \
+ && rm -rf /var/lib/apt/lists
+
+ENV ROUNDCUBE_URL https://github.com/roundcube/roundcubemail/releases/download/1.5.1/roundcubemail-1.5.1-complete.tar.gz
+ENV CARDDAV_URL https://github.com/mstilkerich/rcmcarddav/releases/download/v4.3.0/carddav-v4.3.0.tar.gz
+
+RUN set -eu \
+ && rm -rf /var/www/html/ \
+ && cd /var/www \
+ && curl -sL ${ROUNDCUBE_URL} | tar xz \
+ && curl -sL ${CARDDAV_URL} | tar xz \
+ && mv roundcubemail-* html \
+ && mv carddav html/plugins/ \
+ && cd html \
+ && rm -rf CHANGELOG.md SECURITY.md INSTALL LICENSE README.md UPGRADING composer.json-dist installer composer.* \
+ && ln -sf index.php /var/www/html/sso.php \
+ && ln -sf /dev/stderr /var/www/html/logs/errors.log \
+ && chown -R root:root . \
+ && chown www-data:www-data logs temp \
+ && chmod -R a+rX . \
+ && a2enmod rewrite deflate expires headers \
+ && echo date.timezone=${TZ} > /usr/local/etc/php/conf.d/timezone.ini \
+ && rm -rf plugins/{autologon,example_addressbook,http_authentication,krb_authentication,new_user_identity,password,redundant_attachments,squirrelmail_usercopy,userinfo,virtuser_file,virtuser_query}
+
+# enable database_attachments (and memcache?)
+
+COPY mailu.php /var/www/html/plugins/mailu/mailu.php
+COPY php.ini /
+COPY config.inc.php /
+COPY start.py /
+
+EXPOSE 80/tcp
+VOLUME /data
+VOLUME /overrides
+
+CMD /start.py
+
+HEALTHCHECK CMD curl -f -L -H 'User-Agent: health' http://localhost/ || exit 1
+
+RUN echo $VERSION >> /version