Use matrix build for replica test CI by timvaillancourt · Pull Request #968

Use matrix build for replica test CI by timvaillancourt · Pull Request #968 · github/gh-ost

This PR moves the replica testing CI to matrix builds to make them faster

This reduces the CI runtime from roughly 25 -> 7 minutes 🎉

In case this PR introduced Go code changes:

contributed code is using same conventions as original code
script/cibuild returns with no formatting errors, build errors or unit test errors.