Add Go VPN admin panel with Docker Compose and Postgres 17.

Co-authored-by: Cursor <cursoragent@cursor.com>

docker-compose.yml

@@ -0,0 +1,44 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: vpn-panel
+    restart: unless-stopped
+    ports:
+      - "${APP_PORT:-8080}:8080"
+    env_file:
+      - .env
+    environment:
+      DATABASE_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@postgres:5432/${POSTGRES_DB}?sslmode=disable
+      POSTGRES_HOST: postgres
+    depends_on:
+      postgres:
+        condition: service_healthy
+    networks:
+      - vpn-net
+
+  postgres:
+    image: postgres:17-alpine
+    container_name: vpn-panel-db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ${POSTGRES_DB}
+      POSTGRES_USER: ${POSTGRES_USER}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD}
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER} -d ${POSTGRES_DB}"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+    networks:
+      - vpn-net
+
+volumes:
+  postgres_data:
+
+networks:
+  vpn-net:
+    driver: bridge