update nginx config

using stable tag

currently nextloud does not support mariadb 10.6

add imagemagick and ghotscript to render pdf previews

rename release version

change version tag

nextcloud has removed stable tag :-(

using stable not latest tag

update nginx conf to https://docs.nextcloud.com/server/19/admin_manual/installation/nginx.html

change version

fix bz2 install

add packages

update nginx.conf or 18.0.4

update to version 18

add hints

remove user from cron container

readd magickcore extra and try builtin cron implementation

update to current config from https://github.com/nextcloud/docker/blob/master/.examples/docker-compose/insecure/mariadb-cron-redis/fpm/web/nginx.conf

using version 17

using stable tag

buildin cron file does not work

fix copy paste bug

add secruity fix from https://nextcloud.com/blog/urgent-security-issue-in-nginx-php-fpm/

- add REDIS_HOST - using buildin cron command

unsing temporary tag 16-fpm, because stable-fpm is too old

Update README.md

add github folder

imporve backup script

stable tag is unsupported

update nginx conf