Use a unified docker-compose file

riot/Dockerfile

@@ -0,0 +1,5 @@
+FROM vectorim/riot-web
+
+# Customize instance settings and background
+COPY config.json /app/config.json
+COPY bg.jpg /app/bg.jpg

riot/docker-compose.yml

@@ -1,13 +0,0 @@
-version: "3"
-
-services:
-  riot:
-    image: vectorim/riot-web
-    volumes:
-      - ./config.json:/app/config.json:ro
-      - ./bg.jpg:/app/bg.jpg:ro
-      # - ./welcome.html:/app/welcome.html:ro
-    ports:
-      - 8080:80
-    restart: always
-