Related, GitHub has had 'use more powerful hosted runners' in the pipeline for over 2 years[0]. This issue replaced another now-deleted issue[1] from July 2020.
Really disappointing, as I've had to resort to using `az vm start` -> run -> `az vm deallocate` to use an on-demand powerful runner.
0: https://github.com/github/roadmap/issues/161
1: https://github.com/github/roadmap/issues/95 (note: added `ga` `ae` and removed `beta` `cloud` labels on Oct 13, 2020 ; the previous text: https://web.archive.org/web/20200731200411/https://github.co... )