refactor(nix/buildkite): Restrict step conditionals to refs only r/3667

The previous `condition` abstraction which allowed the full set of
Buildkite conditionals is way too leaky (it lets users to very
Buildkite-specific things which we may not want to allow, and which
are mostly not relevant to a pure evaluation).

Supporting only the `branches` condition (native to Buildkite) should
make it possible to port this to other future CI systems later.

Change-Id: Ib8adcc41db4f1a3566cbeecf13a4228403105c1f
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5051
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>
Reviewed-by: ezemtsov <eugene.zemtsov@gmail.com>
Autosubmit: tazjin <tazjin@tvl.su>

0 files changed, 0 insertions, 0 deletions