* Security fixes when HTTP user does not exist in FreshRSS
* Accept HTTP header X-WebAuth-User for delegated HTTP Authentication
(e.g. Træfik)
* Document delegated HTTP authentication from
FreshRSS#2202

Ubuntu seems to be faster, cf. e.g. PHPBench on:

https://www.phoronix.com/scan.php?page=article&item=freebsd-12-windows&num=5

https://www.phoronix.com/scan.php?page=article&item=docker-summer-2018&num=4
This image is also different from our Alpine-based image as it is using
Apache Event and PHP-FPM as FastCGI. They is also supposed to be faster
for some types of workload than mod_php but with other drawbacks (poorer
control of flush, more processes running...).
So some concreate performance tests would be needed to check whether
this is relevant at all.
It is quite usual for Docker images to offer both a Debian/Ubuntu and an
Alpine version, so we could also do the same if there is any need.
Follow-up of FreshRSS#2202

* Security fixes when HTTP user does not exist in FreshRSS
* Accept HTTP header X-WebAuth-User for delegated HTTP Authentication (e.g. Træfik)
* Document delegated HTTP authentication from #2202

* GMP is needed because Alpine on e.g. ARM runs 32-bit
FreshRSS#2202
* Remove documentation for Træfik HTTP authentication as it is not
compatible with API
FreshRSS#2204

FreshRSS#2208
FreshRSS#2207

* GMP is needed because Alpine on e.g. ARM runs 32-bit
#2202
* Remove documentation for Træfik HTTP authentication as it is not
compatible with API
#2204

#2208
#2207

* Docker image alternative using Ubuntu

Ubuntu seems to be faster, cf. e.g. PHPBench.
It is quite usual for Docker images to offer both a Debian/Ubuntu and an
Alpine version, so we could also do the same if there is any need.
Follow-up of #2202

* Only explicit use of Apache confs

Fix double-logging issue

* Explicit ServerTokens OS

Default Apache configuration in Ubuntu, which was removed when disabling all confs.
It is also the default Apache configuration in Alpine.

* Take advantage of syslog for actualization

Same than for Alpine
43ab629

* COPY_SYSLOG_TO_STDERR

Same as #2213

* Update to libapache2-mod-php instead of php-fpm

* Default to Ubuntu

Ubuntu mod-php wins, being ~14% faster than Ubuntu php-fpm (which was ~300% faster than Alpine mod-php)

* Apache performance
API: Use SetEnvIf if available and fallback to RewriteRule
Docker: Disable unused modules.
Docker: Hard-include .htaccess to avoid having to scan for changes in
that file.
Docker: Disable security check of symlinks, which we do not use ayway.

* Apache readme

* Docker/Apache tuning
Run cron job with correct www-data user instead of root
Remove PHP GMP module uneeded for 64-bit Docker image
Add option to mount custom .htaccess for HTTP authentication
Re-add Apache module for HTTP authentication
Move Alpine-specific instructions to Docker file (instead of Apache
conf) to make it easier to have other base images than Alpine

* Security fixes when HTTP user does not exist in FreshRSS
* Accept HTTP header X-WebAuth-User for delegated HTTP Authentication (e.g. Træfik)
* Document delegated HTTP authentication from FreshRSS#2202

* GMP is needed because Alpine on e.g. ARM runs 32-bit
FreshRSS#2202
* Remove documentation for Træfik HTTP authentication as it is not
compatible with API
FreshRSS#2204

FreshRSS#2208
FreshRSS#2207

* Docker image alternative using Ubuntu

Ubuntu seems to be faster, cf. e.g. PHPBench.
It is quite usual for Docker images to offer both a Debian/Ubuntu and an
Alpine version, so we could also do the same if there is any need.
Follow-up of FreshRSS#2202

* Only explicit use of Apache confs

Fix double-logging issue

* Explicit ServerTokens OS

Default Apache configuration in Ubuntu, which was removed when disabling all confs.
It is also the default Apache configuration in Alpine.

* Take advantage of syslog for actualization

Same than for Alpine
FreshRSS@43ab629

* COPY_SYSLOG_TO_STDERR

Same as FreshRSS#2213

* Update to libapache2-mod-php instead of php-fpm

* Default to Ubuntu

Ubuntu mod-php wins, being ~14% faster than Ubuntu php-fpm (which was ~300% faster than Alpine mod-php)