chore: add icon and color

[adthrasher]

Apparently, best practices for GitHub Actions include an icon and a color. I've somewhat arbitrarily chosen this icon and color.

You can checkout the available colors and icons in the marketplace: https://github.com/marketplace?type=actions. Here is an action that has the same icon (though in white): https://github.com/marketplace/actions/super-linter.

[a-frantz]

This icon seems fine to me, but I wonder if we can use the sprocket logo? If it's a hassle to get that uploaded or whatever, don't worry about it.

[adthrasher]

This icon seems fine to me, but I wonder if we can use the sprocket logo? If it's a hassle to get that uploaded or whatever, don't worry about it.

I think the only way to get a custom icon is to go through a partner verification step. I don't see any documentation about icons and colors, except a prompt when going through the process to release an action. This document mentions badges for verified creators: https://docs.github.com/en/actions/sharing-automations/creating-actions/publishing-actions-in-github-marketplace#about-badges-in-github-marketplace

[a-frantz]

Yea, I would consider that to be a hassle and not worth it (at this time).