chore: import upstream snapshot with attribution

gemini/sample-apps/quickbot/document-search-using-agent-builder/frontend/Dockerfile

@@ -0,0 +1,27 @@
+# Copyright 2025 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 node:18.17.1-alpine AS builder
+
+WORKDIR /app
+COPY . /app/
+
+RUN npm ci
+RUN npm run build:prod
+
+FROM nginx:alpine
+COPY --from=builder /app/dist/quick-bot-app-frontend /usr/share/nginx/html
+COPY --from=builder /app/nginx.conf /etc/nginx/conf.d/
+
+EXPOSE 8080