New Docker (#1813)

* Draft of new Docker

Based on Alpine Linux. Size ~78MB.
https://github.com/FreshRSS/docker-freshrss/issues/4
https://github.com/FreshRSS/FreshRSS/issues/520
https://github.com/FreshRSS/docker-freshrss
https://github.com/FreshRSS/docker-freshrss-production

* Docker readme

* +x execution rights prepare

* Docker readme links to hub.docker.com

https://hub.docker.com/r/freshrss/freshrss/

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+# Deploy FreshRSS with Docker
+* See also https://hub.docker.com/r/freshrss/freshrss/
+
+## Install Docker
+
+```sh
+curl -fsSL https://get.docker.com/ -o get-docker.sh
+sh get-docker.sh
+```
+
+## Optional: Build Docker image of FreshRSS
+Optional, as a *less recent* [online image](https://hub.docker.com/r/freshrss/freshrss/) can be automatically fetched during the next step (run),
+but online images are not available for as many platforms as if you build yourself.
+
+```sh
+# First time only
+git clone https://github.com/FreshRSS/FreshRSS.git
+
+cd ./FreshRSS/
+git pull
+sudo docker pull alpine:3.7
+sudo docker build --tag freshrss/freshrss -f Docker/Dockerfile .
+```
+
+## Run FreshRSS
+
+Example exposing FreshRSS on port 8080. You may have to adapt the network parameters to fit your needs.
+
+```sh
+# You can optionally run from the directory containing the FreshRSS source code:
+cd ./FreshRSS/
+
+# The data will be saved on the host in `./data/`
+mkdir -p ./data/
+
+sudo docker run -dit --restart unless-stopped --log-opt max-size=10m \
+	-v $(pwd)/data:/var/www/FreshRSS/data \
+	-p 8080:80 \
+	--name freshrss freshrss/freshrss
+```
+
+## Update
+
+```sh
+# Rebuild an image (see build section above) or get a new online version:
+sudo docker pull freshrss/freshrss
+# And then 
+sudo docker stop freshrss
+docker rename freshrss freshrss_old
+# See the run section above for the full command
+sudo docker run ...
+# If everything is working, delete the old container
+docker rm freshrss_old
+```
+
+## Command line
+
+```sh
+sudo docker exec -it freshrss php ./cli/list-users.php
+```
+
+See the [CLI documentation](../cli/) for all the other commands.
+
+### Cron job to refresh feeds
+Set a cron job up on your host machine, calling the `actualize_script.php` inside the FreshRSS Docker instance.
+
+#### Example on Debian / Ubuntu
+Create `/etc/cron.d/FreshRSS` with:
+
+```
+7,37 * * * * root docker exec -it freshrss php ./app/actualize_script.php > /tmp/FreshRSS.log 2>&1
+```
+
+## Debugging
+
+```sh
+# See FreshRSS data (it is on the host)
+cd ./data/
+# See Web server logs
+sudo docker logs -f freshrss
+
+# Enter inside FreshRSS docker container
+sudo docker exec -it freshrss sh
+## See FreshRSS root inside the container
+ls /var/www/FreshRSS/
+```
+
+## Deployment in production
+
+Use a reverse proxy on your host server, such as [Træfik](https://traefik.io/) or [nginx](https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/),
+with HTTPS, for instance using [Let’s Encrypt](https://letsencrypt.org/).