fix(backend): Add postgres run configuration for persistent database

legalconsenthub-backend/docker-compose.yml

@@ -0,0 +1,20 @@
+version: '3.8'
+
+services:
+  postgres:
+    image: postgres:17-alpine
+    container_name: legalconsenthub-postgres
+    environment:
+      POSTGRES_DB: legalconsenthub
+      POSTGRES_USER: legalconsenthub
+      POSTGRES_PASSWORD: legalconsenthub
+    ports:
+      - "5432:5432"
+    volumes:
+      - ./postgres-data:/var/lib/postgresql/data
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U legalconsenthub -d legalconsenthub"]
+      interval: 10s
+      timeout: 5s
+      retries: 5