Add singularity to hepwlbuilder image, remove singularity-executor image (BMK-77, BMK-145)
Succeeds on my CI https://gitlab.cern.ch/valassi/hep-workloads/-/jobs/4846175
Add singularity to hepwlbuilder image, remove singularity-executor image (BMK-77, BMK-145)
Succeeds on my CI https://gitlab.cern.ch/valassi/hep-workloads/-/jobs/4846175