Add playground backend and proxy

playground/nginx_container/Dockerfile

@@ -0,0 +1,49 @@
+# 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.
+
+FROM nginx:1.27-alpine
+
+# Install openssl for auto-generating self-signed dev certificates and curl for healthchecks
+RUN apk add --no-cache openssl curl bash
+
+# Create directory structure
+RUN mkdir -p /etc/nginx/conf.d \
+             /etc/nginx/includes \
+             /etc/nginx/certs \
+             /usr/share/nginx/html
+
+# Copy main Nginx configuration
+COPY conf/nginx.conf /etc/nginx/nginx.conf
+
+# Clear base image default configs and copy custom configs
+RUN rm -rf /etc/nginx/conf.d/*
+COPY conf/conf.d/ /etc/nginx/conf.d/
+COPY conf/includes/ /etc/nginx/includes/
+
+# Copy custom error templates and fallback static files
+COPY html/ /usr/share/nginx/html/
+
+# Copy entrypoint script
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+RUN chmod +x /docker-entrypoint.sh
+
+# Expose standard HTTP and HTTPS ports
+EXPOSE 80 443
+
+# Healthcheck to ensure Nginx is responding
+HEALTHCHECK --interval=15s --timeout=3s --start-period=5s --retries=3 \
+  CMD curl -k -f https://localhost/healthz || curl -f http://localhost:80/healthz || exit 1
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["nginx", "-g", "daemon off;"]