Modify Renovate to apply appropriate labels to docker PRs

[AetherUnbound]

Description

This PR changes the Renovate config so that it applies the docker-specific labels appropriately. I noticed in #1109 that instead of adding the 4 base labels and the docker label, Renovate instead only added the Docker label. Based on their documentation, it seems like using the packageRules directive is the correct way to apply multiple sets of labels rather than using docker.labels.

Additionally, the config referenced a repo which is now archived. It's a wonder it was working at all!

Testing Instructions

I'm not sure how to test this...open to suggestions 🙂

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[dhruvkb]

It looks right to me and matches the docs. I did have to look up the list of valid datasources and "docker" is one of them.