Use an errgroup helper to evaluate result refs concurrently during forced
evaluation, and fail fast on the first evaluation error.
This mitigates current case in bake where chained targets with
a multi-platform build could miss secrets and other session properties.
The outline for the issue case:
- Base target is solved but only lazily and not really loaded/tracked
in build graph yet.
- Child targets are loaded, base target waits.
- Evaluate is called for base stage (because it might be missing result
condition), child stage is processed as build result. This happens in
parallel.
- Because `Evaluate()` was called synchronously, it may have not been
called yet for the second platform while the child target already
needs to run `RUN --mount=type=secret`.
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Tonis Tiigi
2adc53cfb3