Repository should be renamed

[Xrayez]

When cloning or changing directories, I often forget which repository doesn't have godot- prefixed.

Therefore, the repository's existing name build-containers should be renamed to godot-build-containers, this would be consistent with godot-build-scripts. Or vice versa, but according to other Godot repositories, most have godot- prefixed.

Unless I'm missing the rationale of the current name, I'd appreciate an explanation.

On the side note, I wish both build-containers and godot-build-scripts could just be merged together, perhaps (there are even some PRs which depend on changes in both).