Docker new :newest image (#3294)

* Docker new :Edge image

New optional Docker image to test upcoming software versions, using
Alpine:Edge
Similar than https://github.com/FreshRSS/FreshRSS/pull/3274 (oldest
image) but for newest.
Usefull for e.g. testing PHP8
https://github.com/FreshRSS/FreshRSS/issues/3082 , MySQL 8
https://github.com/FreshRSS/FreshRSS/issues/3191

* Syntax if symlink already exists in future edge

* Rename to newest

Better match our "Oldest" version, and to avoid conflicts with the
potential renaming of our master branch

* Update Docker/Dockerfile-Newest

Co-authored-by: Frans de Jonge <fransdejonge@gmail.com>

Co-authored-by: Frans de Jonge <fransdejonge@gmail.com>

Docker/Dockerfile-Newest

@@ -0,0 +1,60 @@
+FROM alpine:edge
+
+ENV TZ UTC
+SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
+RUN apk add --no-cache \
+	apache2 php8-apache2 \
+	php8 php8-curl php8-gmp php8-intl php8-mbstring php8-xml php8-zip \
+	php8-ctype php8-dom php8-fileinfo php8-iconv php8-json php8-opcache php8-phar php8-session php8-simplexml php8-xmlreader php8-xmlwriter php8-tokenizer php8-zlib \
+	php8-pdo_sqlite php8-pdo_mysql php8-pdo_pgsql
+
+RUN mkdir -p /var/www/FreshRSS /run/apache2/
+WORKDIR /var/www/FreshRSS
+
+COPY . /var/www/FreshRSS
+COPY ./Docker/*.Apache.conf /etc/apache2/conf.d/
+
+ARG FRESHRSS_VERSION
+ARG SOURCE_BRANCH
+ARG SOURCE_COMMIT
+
+LABEL \
+	org.opencontainers.image.authors="Alkarex" \
+	org.opencontainers.image.description="A self-hosted RSS feed aggregator" \
+	org.opencontainers.image.documentation="https://freshrss.github.io/FreshRSS/" \
+	org.opencontainers.image.licenses="AGPL-3.0" \
+	org.opencontainers.image.revision="${SOURCE_BRANCH}.${SOURCE_COMMIT}" \
+	org.opencontainers.image.source="https://github.com/FreshRSS/FreshRSS" \
+	org.opencontainers.image.title="FreshRSS" \
+	org.opencontainers.image.url="https://freshrss.org/" \
+	org.opencontainers.image.vendor="FreshRSS" \
+	org.opencontainers.image.version="$FRESHRSS_VERSION"
+
+RUN rm -f /etc/apache2/conf.d/languages.conf /etc/apache2/conf.d/info.conf \
+		/etc/apache2/conf.d/status.conf /etc/apache2/conf.d/userdir.conf && \
+	sed -r -i "/^\s*LoadModule .*mod_(alias|autoindex|negotiation|status).so$/s/^/#/" \
+		/etc/apache2/httpd.conf && \
+	sed -r -i "/^\s*#\s*LoadModule .*mod_(deflate|expires|headers|mime|remoteip|setenvif).so$/s/^\s*#//" \
+		/etc/apache2/httpd.conf && \
+	sed -r -i "/^\s*(CustomLog|ErrorLog|Listen) /s/^/#/" \
+		/etc/apache2/httpd.conf && \
+	# https://bugs.php.net/bug.php?id=78681 \
+	sed -r -i "s/php8_module/php_module/" \
+		/etc/apache2/conf.d/php8-module.conf && \
+	if [ ! -f /usr/bin/php ]; then ln -s /usr/bin/php8 /usr/bin/php; else true; fi && \
+	touch /var/www/FreshRSS/Docker/env.txt && \
+	echo "27,57 * * * * . /var/www/FreshRSS/Docker/env.txt; \
+		su apache -s /bin/sh -c 'php /var/www/FreshRSS/app/actualize_script.php' \
+		2>> /proc/1/fd/2 > /tmp/FreshRSS.log" | crontab -
+
+ENV COPY_LOG_TO_SYSLOG On
+ENV COPY_SYSLOG_TO_STDERR On
+ENV CRON_MIN ''
+ENV FRESHRSS_ENV ''
+
+ENTRYPOINT ["./Docker/entrypoint.sh"]
+
+EXPOSE 80
+# hadolint ignore=DL3025
+CMD ([ -z "$CRON_MIN" ] || crond -d 6) && \
+	exec httpd -D FOREGROUND