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>

models/db.js

@@ -1,4 +1,5 @@
 const Umzug = require('umzug');
+const config = require('config')
 
 function sequel_log(a,b,c) {
   console.log(a);
@@ -17,7 +18,7 @@ const sequelize = new Sequelize('database', 'username', 'password', {
   },
 
   // SQLite only
-  storage: 'database.sqlite',
+  storage: config.get('storage_local_db'),
   logging: sequel_log,
 
   // http://docs.sequelizejs.com/manual/tutorial/querying.html#operators