sharp fails to compile

[lishaduck]

sharp requires vips, so node-gyp fails to install on Alpine all of a sudden.

Originally posted by @lishaduck in #1712

[lishaduck]

(Sorry, meant to post this to @gh-metrics)

[lishaduck]

Anway, if anyone hits this, they can migrate to gh-metrics/metrics, where I think I fixed it (haven't gotten tests to run on v3 yet)