With this change, the query we make to Buildkite changes from
explicitly querying for a specific number of *ancestor* builds, to
any latest builds of the default branch that have a drvmap.
This is not really supported by Buildkite, it seems, and the query to
do it feels very wonky and requires a lot of fiddling with `jq` to get
the output into the right shape.
We lose the information about which build we downloaded this from in
the output. Adding that information back would make the `jq` query
much more complex.
Change-Id: I9e7cecdffa9ac09f9e0339eb24d98c0e8dd82292
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9168
Tested-by: BuildkiteCI
Reviewed-by: ezemtsov <eugene.zemtsov@gmail.com>
ba9a62ca9f