Add simple docker compose configuration

docker-compose-simple.yml

@@ -0,0 +1,31 @@
+version: '3'
+services:
+  gonito:
+    image: loxygen/gonito:latest
+    depends_on:
+      - postgres
+    environment:
+      - PGUSER=postgres
+      - PGPASS=$POSTGRES_PASSWORD
+      - PGHOST=postgres
+      - ADMINUSER=$GONITO_ADMINUSER
+      - ADMINPASS=$GONITO_ADMINPASS
+      - LOCATION=$GONITO_LOCATION
+      - APPROOT=$GONITO_APPROOT
+      - LEADERBOARD_STYLE=${GONITO_LEADERBOARD_STYLE:-by-tag}
+      - AUTO_OPENING=${GONITO_AUTO_OPENING:-false}
+      - IS_PUBLIC=${GONITO_IS_PUBLIC:-true}
+    ports:
+      - 3000:3000
+    volumes:
+      - "${GONITO_ARENA_VOLUME}:/gonito/arena"
+      - "${GONITO_SSH_DIRECTORY}:/root/.ssh"
+  postgres:
+    image: postgres
+    environment:
+      - POSTGRES_PASSWORD=$POSTGRES_PASSWORD
+      - POSTGRES_DB=gonito
+    expose:
+      - "5432"
+    volumes:
+      - "${PG_DATA_VOLUME}:/var/lib/postgresql/data"