feat: add Gradio sample

Author: jackwotherspoon

run/helloworld-gradio/README.md

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+# Cloud Run Hello World Gradio Sample
+
+This sample shows how to deploy a Hello World Gradio application to Cloud Run.
+
+[![Run in Google Cloud][run_img]][run_link]
+
+[run_img]: https://storage.googleapis.com/cloudrun/button.svg
+[run_link]: https://console.cloud.google.com/cloudshell/editor?shellonly=true&cloudshell_image=gcr.io/cloudrun/button&cloudshell_git_repo=https://github.com/GoogleCloudPlatform/python-docs-samples&cloudshell_working_dir=run/helloworld-gradio
+
+## Deploy
+
+```sh
+# Ensure you have set your Google Cloud Project ID
+gcloud config set project <PROJECT_ID>
+
+# Deploy to Cloud Run
+gcloud run deploy helloworld-gradio --source .
+```
+
+For more details on how to work with this sample, read the [Python Cloud Run Samples README](https://github.com/GoogleCloudPlatform/python-docs-samples/tree/main/run)

run/helloworld-gradio/main.py

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+# 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.
+
+# [START cloudrun_helloworld_gradio]
+import gradio as gr
+
+def hello(name, intensity):
+    """Return a friendly greeting."""
+    return "Hello " + name + "!" * int(intensity)
+
+demo = gr.Interface(
+    fn=hello,
+    inputs=["text", "slider"],
+    outputs=["text"],
+    title="Hello World 👋🌎",
+    description=("Type your name below and hit 'Submit', and try the slider to "
+                 "make the greeting louder!"),
+    theme="soft",
+    flagging_mode="never",
+)
+
+demo.launch()
+# [END cloudrun_helloworld_gradio]

run/helloworld-gradio/requirements.txt

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+gradio==5.39.0