Add playground backend and proxy

playground/nginx_container/docker-compose.yml

@@ -0,0 +1,44 @@
+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+version: '3.8'
+
+services:
+  nginx-proxy:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: artemis-nginx-proxy
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+    volumes:
+      # Mount certificates from host (or let entrypoint generate dev certs)
+      - ./certs:/etc/nginx/certs:ro
+    networks:
+      - artemis-net
+    extra_hosts:
+      # Allows reaching Cuttlefish / Cloud Orchestrator running on the COS host
+      - "host.docker.internal:host-gateway"
+    healthcheck:
+      test: ["CMD", "curl", "-k", "-f", "https://localhost/healthz"]
+      interval: 15s
+      timeout: 3s
+      retries: 3
+
+networks:
+  artemis-net:
+    name: artemis-net
+    driver: bridge