chore: add Docker local development environment (#16)

Author: SparkZou

README.md

@@ -35,6 +35,36 @@ Star memU-server to get notified about new releases and join our growing communi
    ```
    The server runs on `http://127.0.0.1:8000`.
 
+### Run local infrastructure with Docker Compose
+Start local infrastructure dependencies (PostgreSQL and Temporal). Start the FastAPI API server separately (see "Run from source" above):
+
+```bash
+# Start infrastructure services (PostgreSQL, Temporal, Temporal UI)
+docker compose up -d
+
+# View logs
+docker compose logs -f
+```
+
+**Services:**
+| Service | Port | Description |
+|---------|------|-------------|
+| PostgreSQL | 5432 | Database with pgvector extension |
+| Temporal | 7233 | Workflow engine gRPC API |
+| Temporal UI | 8088 | Web management interface |
+
+**Default Configuration:**
+- PostgreSQL DSN: `postgresql://postgres:postgres@localhost:5432/memu`
+- Temporal Database: `temporal` (separate from app database)
+
+**Environment Variables (optional `.env` file):**
+```env
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres
+POSTGRES_DB=memu
+TEMPORAL_DB=temporal
+```
+
 ### Run with Docker
 1. Export your OpenAI API key so Docker can read it:
    ```bash

docker-compose.yml

@@ -0,0 +1,65 @@
+services:
+  # PostgreSQL with pgvector extension
+  postgres:
+    image: pgvector/pgvector:pg16
+    environment:
+      POSTGRES_USER: ${POSTGRES_USER:-postgres}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-postgres}
+      POSTGRES_DB: ${POSTGRES_DB:-memu}
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-postgres}"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    networks:
+      - memu-network
+
+  # Temporal server
+  # Note: Temporal shares the same PostgreSQL instance as the main app but uses
+  # a separate database (`TEMPORAL_DB`, default: `temporal`) from the app's
+  # database (`POSTGRES_DB`, default: `memu`).
+  # TODO: For production, consider using a separate PostgreSQL instance for Temporal
+  # or at minimum keep Temporal and the app in separate databases as configured here.
+  # Pointing both services at the same database can cause schema conflicts and is
+  # not recommended.
+  temporal:
+    image: temporalio/auto-setup:1.25.1
+    depends_on:
+      postgres:
+        condition: service_healthy
+    environment:
+      - DB=postgresql
+      - DB_PORT=5432
+      - POSTGRES_USER=${POSTGRES_USER:-postgres}
+      - POSTGRES_PWD=${POSTGRES_PASSWORD:-postgres}
+      - POSTGRES_SEEDS=postgres
+      - POSTGRES_DB=${TEMPORAL_DB:-temporal}
+      - DYNAMIC_CONFIG_FILE_PATH=config/dynamicconfig/development-sql.yaml
+    ports:
+      - "7233:7233"  # Temporal gRPC
+    networks:
+      - memu-network
+
+  # Temporal Web UI
+  temporal-ui:
+    image: temporalio/ui:2.31.2
+    depends_on:
+      - temporal
+    environment:
+      - TEMPORAL_ADDRESS=temporal:7233
+    ports:
+      - "8088:8080"  # Temporal Web UI
+    networks:
+      - memu-network
+
+volumes:
+  postgres-data:
+    driver: local
+
+networks:
+  memu-network:
+    driver: bridge