add docker compose file with mongodb configured

docker-compose.yml

@@ -0,0 +1,36 @@
+services:
+  mongo:
+    image: mongo
+    container_name: mongo
+    restart: unless-stopped
+
+    # ---------- credentials ----------
+    environment:
+      MONGO_INITDB_ROOT_USERNAME: ${MONGO_ROOT_USER}
+      MONGO_INITDB_ROOT_PASSWORD: ${MONGO_ROOT_PASSWORD}
+
+    # ---------- persistence ----------
+    volumes:
+      # primary data store
+      - mongo_data:/data/db
+      # (optional) replica‑set metadata; small but useful to persist
+      - mongo_cfg:/data/configdb
+      # seed scripts for first‑run init (create users, seed collections, etc.)
+      - ./mongo/init:/docker-entrypoint-initdb.d:ro
+
+    # ---------- networking ----------
+    # Only published when the 'dev' profile is active
+    ports:
+      - "${MONGO_PORT}:27017"
+
+    # ---------- basic health check ----------
+    healthcheck:
+      test: ["CMD", "mongosh", "--quiet", "--eval", "db.adminCommand('ping')"]
+      interval: 30s
+      timeout: 10s
+      retries: 5
+
+# ---------- named volumes ----------
+volumes:
+  mongo_data:
+  mongo_cfg: