feat(buildkite/mkPipeline): allow fast failure for build steps r/4565

This is supposed to help with resource wasting in situations when
multiple dynamic steps depend on a failing derivation. Cost of
failure currently is `C = T * D` where:
 - T -> time to compile the failing derivation
 - D -> amount of CI targets depending on a failing derivation

Switching to `Fail Fast` limits it to just T (time of a single
failure). Which helps a lot, especially while upgrading nixpkgs.

Fast fail at this moment is in preview, so to enable it:
 - Enable `Fail Fast` feature at pipeline or organization level
 - Set `cancelOnBuildFailing` parameter to true for `mkPipeline`

Change-Id: I4373a46633522d21e94cfa8bac35243b4eeb0b9c
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6243
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

0 files changed, 0 insertions, 0 deletions