Buildkite pipeline for QuantumClifford

Bump dawidd6/action-download-artifact from 7 to 8 (#470)

Failed in 24m 28s
Downstream Breakage CI on Buildkiteecho "Julia depot path ${JULIA_DEPOT_PATH}" && julia --project='~' -e ' using Pkg; pkg"dev .";' && julia --project='~' -e ' using Pkg; Pkg.add("QuantumSavory"); Pkg.build("QuantumSavory"); Pkg.test("QuantumSavory"); Pkg.add("BPGates"); Pkg.build("BPGates"); Pkg.test("BPGates");'
Waited 1s
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Ran in 8m 41s
Total Job Run Time: 33m 7s