feat: add PostgreSQL dev container compose file

compose.dev.yml

@@ -0,0 +1,20 @@
+services:
+  postgres:
+    image: postgres:17
+    container_name: local-cal-postgres
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_USER: localcal
+      POSTGRES_PASSWORD: localcal
+      POSTGRES_DB: localcal
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U localcal"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+
+volumes:
+  postgres_data: