Cloud Run "Hello" container

test

This repository contains the source code of a sample Go application that is
distributed as the public container image (us-docker.pkg.dev/cloudrun/container/hello) used in the
Cloud Run quickstart and as
the suggested container image in the Cloud Run UI on Cloud Console.

It also contains the source code of a placeholder public container
(us-docker.pkg.dev/cloudrun/container/placeholder) used to create a placeholder revision when setting up
Continuous Deployment.

Set a COLOR environment variable to a valid CSS color to change the background color.

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