grafana image: builder layer needs to be hermetic and reproducable
Created by: uwedeportivo
fixes broken build due to upgrades in alpine
https://buildkite.com/sourcegraph/sourcegraph/builds/45470#719a60ce-b15d-4632-8533-dbb37c889211
Created by: uwedeportivo
fixes broken build due to upgrades in alpine
https://buildkite.com/sourcegraph/sourcegraph/builds/45470#719a60ce-b15d-4632-8533-dbb37c889211