Add production Alpine and Debian Stretch Docker images (#225)

* First pass at a (swarm-compatible) docker image

Uses an existing traefik server as a https reverse proxy.

* Add example config for a Docker swarm deployment

* Point to traefik config for docker compose setup

* Clarify that traefik is needed for the example config

* Use node:8-stretch base image and don't install yarn

(The base image already contains yarn.)

* Initial commit for an Alpine Docker image

* Fix docker volume path

* Merge #213 and #225 and move files around

* Remove unnecessary dependencies from the alpine build

* Update Dockerfiles to match install path, config path, etc.

* Update the configuration in the example compose file

* Update the configuration in the example swarm file

* Remove the declared networks and volumes from the compose example, which are not strictly required

* Update attachment path in the documentation

* Display traefik as a suggestion and not a required dependency

* Update the Docker ignored files

* Fix typos reported in #225

* Move production Dockerfiles to a production directory

* Add the redis configuration settings

* Add Docker files to the dockerignore

* Make the signup limit configurable

1 files changed, 22 insertions, 2 deletions

diff --git a/README.md b/README.md
index 4d9cc298f..202d6680d 100644
--- a/README.md
+++ b/README.md
@@ -65,8 +65,8 @@ donating to them](https://soutenir.framasoft.org/en/).**
 Want to see it in action?
 
    * Demonstration servers:
-     * [peertube.cpy.re](http://peertube.cpy.re) 
-     * [peertube2.cpy.re](http://peertube2.cpy.re) 
+     * [peertube.cpy.re](http://peertube.cpy.re)
+     * [peertube2.cpy.re](http://peertube2.cpy.re)
      * [peertube3.cpy.re](http://peertube3.cpy.re)
    * [Video](https://peertube.cpy.re/videos/watch/f78a97f8-a142-4ce1-a5bd-154bf9386504)
      to see what the "decentralization feature" looks like
@@ -139,6 +139,26 @@ BitTorrent) inside the web browser, as of today.
   * OpenSSL (cli)
   * FFmpeg
 
+## Run using Docker
+
+You can quickly get a server running using Docker. You need to have [docker](https://www.docker.com/community-edition) and [docker-compose](https://docs.docker.com/compose/install/) installed.
+
+For this example configuration, you should also run a reverse proxy. The example
+Docker Compose file provides example labels for the Traefik load balancer,
+though any HTTP reverse proxy is compatible.
+
+Example for running a peertube server locally:
+
+```bash
+sudo \
+  PEERTUBE_HOSTNAME=peertube.lvh.me \
+  PEERTUBE_ADMIN_EMAIL=test@example.com \
+  PEERTUBE_TRANSCODING_ENABLED=true \
+  docker-compose up app
+```
+
+(Get the initial root user password from the program output.)
+
 ## Production
 
 See the [production guide](support/doc/production.md).