Add a label for environmental sustainability/energy consumption issues
I happened to stumble upon this repository while doing investigation for writing an article about GitLab's environmental impact and environmental sustainability policies. I noticed how issues on gitlab-com, for example this one about the company's (employee) carbon footprint and on gitlab-org about GitLab-managed kubernetes clusters do not have specific labels that imply energy reduction or sustainability.
I think it would improve findability, and thus relevance of the subject if there would exist a label that puts these issues in a more specific category.
Since this repository did not specify what kind of sustainability it is about, I think this issue fits here. If it is specifically about some other form of sustainability it should probably be moved.