server docker image: alpine image packages
Created by: uwedeportivo
not sure why this changed but
https://buildkite.com/sourcegraph/e2e/builds/9941#a244d360-96ad-4668-a383-8d9895300b57
double checked with
docker run -it --entrypoint=sh alpine:3.10@sha256:e4355b66995c96b4b468159fc5c7e3540fcef961189ca13fee877798649f531a -c /bin/sh
and running the apk commands by hand and verifying with https://pkgs.alpinelinux.org/packages?name=git&branch=v3.10