Add root docker-compose and webapp Dockerfile/nginx for full-stack deployment

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,47 @@
+services:
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: ralph
+      POSTGRES_PASSWORD: ralph
+      POSTGRES_DB: ralph
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ralph"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+  migrate:
+    build: ./backend
+    command: ["/migrate"]
+    environment:
+      DATABASE_URL: postgres://ralph:ralph@postgres:5432/ralph?sslmode=disable
+    depends_on:
+      postgres:
+        condition: service_healthy
+    restart: on-failure
+
+  api:
+    build: ./backend
+    ports:
+      - "8080:8080"
+    environment:
+      DATABASE_URL: postgres://ralph:ralph@postgres:5432/ralph?sslmode=disable
+      LISTEN_ADDR: :8080
+    depends_on:
+      migrate:
+        condition: service_completed_successfully
+    restart: unless-stopped
+
+  webapp:
+    build: ./webapp
+    ports:
+      - "9050:80"
+    depends_on:
+      - api
+    restart: unless-stopped
+
+volumes:
+  pgdata: