Port ancillary jobs from Travis to github actions#5457

Merged

thomasspriggs merged 4 commits intodiffblue:developfrom

thomasspriggs:tas/gha_ancillaries

Aug 21, 2020

Commits on Aug 20, 2020

Commits on Aug 21, 2020

Remove redundant use of `script_folder` environment variable
thomasspriggs
committed