Pierre Bourdon
720db63d52
Instead of just going for "whatever is the oldest build we know of", use the following first: - Is the step more constrained? If so, schedule it first to avoid filling up "more desirable" build slots with less constrained builds. - Does the step have more dependents? If so, schedule it first to try and maximize open parallelism and breadth of scheduling options. (cherry picked from commit https://git.lix.systems/lix-project/hydra/commit/b8d03adaf45105452bf1040deeaaccc8b8b22efb)