Test on arm64v8 instead of i386 (which isn't supported in Ubuntu 20.04+)

Author: tianon

.github/workflows/ci.yml

@@ -25,6 +25,8 @@ jobs:
           git clone --depth 1 https://github.com/docker-library/bashbrew.git -b master ~/bashbrew
           strategy="$(~/bashbrew/scripts/github-actions/generate.sh)"
           strategy="$(~/bashbrew/scripts/github-actions/munge-i386.sh -c <<<"$strategy")"
+          strategy="$(sed -e 's/i386/arm64v8/g' <<<"$strategy")" # Ubuntu no longer supports i386, so we have to get a little more clever
+          strategy="$(jq -c '.matrix.include[].runs |= if .pull | test("arm64") then .prepare += "\nsudo apt-get update && sudo apt-get install -y qemu-user-static" else . end' <<<"$strategy")"
           jq . <<<"$strategy" # sanity check / debugging aid
           echo "::set-output name=strategy::$strategy"