Set and use GH_SLACK_USERNAME_MAP as an environment variable

[krysal]

Fixes

Follow up of #2053.

Description

Previous changes to the staging-frontend-nuxt-deploy action are not working because the encrypted secrets cannot be used directly, they need to be provided to actions as an input or environment variable, according to GitHub docs. I use an envvar here so trying again to see if it works.

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[github-actions]

Storybook and Tailwind configuration previews: Ready

Storybook: https://wordpress.github.io/openverse-frontend/_preview/2055
Tailwind: https://wordpress.github.io/openverse-frontend/_preview/2055/tailwind

Please note that GitHub pages takes a little time to deploy newly pushed code, if the links above don't work or you see old versions, wait 5 minutes and try again.

You can check the GitHub pages deployment action list to see the current status of the deployments.

[github-actions]

Playwright Failure Test Results

It looks like some of the Playwright tests failed. You can download the Playwright trace
output for both Storybook and Nuxt Playwright tests that have failed at the bottom of this
page, under the "Artifacts" section:

https://github.com/WordPress/openverse-frontend/actions/runs/3735484323

Read more about how to use this artifact here: https://github.com/WordPress/openverse-frontend/blob/main/test/playwright/README.md#debugging