better gzip behavior in case of previous day failures
better gzip behavior in case of previous day failures

keep compressed copy, force overwrite, only delete uncompressed version
if everything succeeds

IainNZ/PackageEvaluator.jl,IainNZ/PackageEvaluator.jl,IainNZ/PackageEvaluator.jl,JuliaCI/PackageEvaluator.jl,ScottPJones/PackageEvaluator.jl,JuliaCI/PackageEvaluator.jl,ScottPJones/PackageEvaluator.jl,ScottPJones/PackageEvaluator.jl,JuliaCI/PackageEvaluator.jl