docs/data/reusables/actions/redis-environment-variables.md

The *client.js* script looks for the `REDIS_HOST` and `REDIS_PORT` environment variables to create the client. The workflow sets those two environment variables as part of the "Connect to Redis" step to make them available to the *client.js* script. For more information about the script, see "[Testing the Redis service container](#testing-the-redis-service-container)."