Add artifacts for osx runner

Based on linux artifacts, which is working.
3 jobs for rtoy-issue-76-add-ansi-tests-to-ci in 18 minutes and 58 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
passed #4221
linux
linux-runner

00:06:20

passed #4223
osx
osx-runner

00:12:37

failed #4222
osx
osx-runner

00:11:56