feat(run): add helloworld samples for FastAPI, Streamlit and Gradio

[jackwotherspoon]

This PR adds "Hello World" samples for Cloud Run deployments with new buildpacks support for FastAPI (uvicorn), Streamlit and Gradio.

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Here is the summary of changes.

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• run/helloworld-fastapi/main.py:15, tag cloudrun_helloworld_fastapi
• run/helloworld-streamlit/main.py:15, tag cloudrun_helloworld_streamlit

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[steren]

@jackwotherspoon thanks for the PR. Would it be possible to add a Gradio tutorial too?

We will also have out of the box Gradio support. And Gradio is quite popular in the data / AI community.

[jackwotherspoon]

Would it be possible to add a Gradio tutorial too?

We will also have out of the box Gradio support. And Gradio is quite popular in the data / AI community.

@steren I have added a Gradio sample, just need to work on some tests for it 👍

[glasnt]

Is this PR ready for review? if so please change it away from "draft"

[jackwotherspoon]

Is this PR ready for review? if so please change it away from "draft"

Yup, the feature has now rolled out, I will work on adding integration tests and then mark ready for review 👍