Add docker files (#55)

* Add docker files

* Improve docker-compose compatibility

* Use Openstack's standard port

* Use package ffmpeg-dev instead of ffmpeg

* improve dockerfile and config

* Add short docker guide

* adhere to previous naming conventions

* document former json comments

* Undo init.sh approach to touching the db file

* Make clear that it's about files on the host system

* add local path specifier

Co-authored-by: Denys Vitali <denys.vitali@swisscom.com>

README.md

@@ -42,7 +42,7 @@ To install all node dependencies, run (do this once):
 
 # Configuration
 
-See [config/default.json](config/default.json)
+See [config/default.json](config/default.json). Set `storage_local_path` for a local sqlite database or `storage_region`, `storage_bucket`, `storage_cdn` and `storage_endpoint` for AWS S3. `mail_provider` may be one of `console` or `smtp`. Also, omit a trailing `/` for the `endpoint`.
 
 # Run (web server)
 
@@ -63,6 +63,16 @@ For advanced media conversion:
 By default, media files are uploaded to the ```storage``` folder.
 The database is stored in ```database.sqlite``` by default.
 
+# Run with Docker
+
+- configure `config/default.json`
+- configure `volumes` section inside `docker-compose.yml`
+  - point to `database.sqlite` on the host system
+  - `touch database.sqlite` if it not exists
+  - point to `storage/` on the host system
+  - `mkdir storage/` if it not exists
+- start the container with `sudo docker-compose up -f docker-compose.yml -d --build`
+
 # Hacking
 
 To rebuild the frontend CSS styles: