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>

docker-compose.yml

@@ -0,0 +1,12 @@
+version: "2.0"
+
+services:
+  spacedeck:
+    build: .
+    container_name: spacedeck
+    ports:
+      - "9666:9666"
+    volumes:
+      - /absolute/path/to/storage:/app/storage
+      - /absolute/path/to/database.sqlite:/app/database.sqlite
+