Test freedesktop-sdk against buildstream2 in CI
Run overnight freedesktop-sdk tests against a bst2-compatible branch of freedesktop-sdk.
Current best candidate: freedesktop-sdk-20.08beta.1-buildstream2
Depends on freedesktop-sdk/freedesktop-sdk!2925 (merged)
Fixes #1334 (closed) and celduin/bsps/bst-boardconsumption#21 (closed)
Edited by Javier Jardón