Add Docker setup, .env.example, updated .gitignore/CHANGELOG and ADRs 004-007 + arc42 template

docker-compose.yml

@@ -0,0 +1,82 @@
+version: "3.9"
+
+services:
+  playout:
+    build:
+      context: ./backend/playout
+      dockerfile: Dockerfile
+    container_name: linearvoid-playout
+    restart: unless-stopped
+    env_file:
+      - .env
+    volumes:
+      - ./data/playlist:/app/playlist:ro
+      - ./data/hls:/app/hls
+    networks:
+      - linearvoid-net
+    depends_on:
+      - redis
+
+  chat:
+    build:
+      context: ./backend/chat
+      dockerfile: Dockerfile
+    container_name: linearvoid-chat
+    restart: unless-stopped
+    env_file:
+      - .env
+    ports:
+      - "${CHAT_PORT:-3000}:3000"
+    networks:
+      - linearvoid-net
+    depends_on:
+      - redis
+      - db
+
+  nginx:
+    build:
+      context: ./infrastructure/nginx
+      dockerfile: Dockerfile
+    container_name: linearvoid-nginx
+    restart: unless-stopped
+    ports:
+      - "${NGINX_PORT:-8080}:80"
+    volumes:
+      - ./frontend/dist:/usr/share/nginx/html:ro
+      - ./data/hls:/usr/share/nginx/html/hls:ro
+    networks:
+      - linearvoid-net
+    depends_on:
+      - playout
+      - chat
+
+  redis:
+    image: redis:7-alpine
+    container_name: linearvoid-redis
+    restart: unless-stopped
+    command: redis-server --appendonly yes
+    volumes:
+      - redis-data:/data
+    networks:
+      - linearvoid-net
+
+  db:
+    image: postgres:15-alpine
+    container_name: linearvoid-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: linearvoid
+      POSTGRES_USER: linearvoid
+      POSTGRES_PASSWORD: linearvoid
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    networks:
+      - linearvoid-net
+
+networks:
+  linearvoid-net:
+    driver: bridge
+
+volumes:
+  redis-data:
+  postgres-data: