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>

config/default.json

@@ -6,13 +6,11 @@
   "invite_code": "top-sekrit",
 
   "storage_region": "eu-central-1",
-  //"storage_bucket": "sdeck-development",
-  //"storage_cdn": "http://localhost:9123/sdeck-development",
-  //"storage_endpoint": "http://storage:9000",
 
   "storage_bucket": "my_spacedeck_bucket",
   "storage_cdn": "/storage",
   "storage_local_path": "./storage",
+  "storage_local_db": "./database.sqlite",
 
   "redis_mock": true,
   "mongodb_host": "localhost",
@@ -23,7 +21,6 @@
   "admin_pass": "very_secret_admin_password",
   "phantom_api_secret": "very_secret_phantom_password",
 
-  // Choose "console" or "smtp"
   "mail_provider": "smtp",
   "mail_smtp_host": "your.smtp.host",
   "mail_smtp_port": 465,