Pipelines: Ensure consistent spack version for entire pipeline
Pipelines: Ensure consistent spack version for entire pipeline

Also retry jobs always, as script failure is not confined to only our
spack ci rebuild command exit code.

LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,iulian787/spack,iulian787/spack,iulian787/spack,LLNL/spack,iulian787/spack,iulian787/spack