build: Abort build if DD4hep does not have DDDetectors #708
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We need
DDDetectors
for the DD4hep XML loading to work. If it's not present, errors like in #706 pop up at runtime.This PR explicitly requests
DDDetectors
is available. This will fail in the CI right now, because ourubuntu2004
CI image builds DD4hep without it. A fix for that is pending here: acts-project/machines#29.I will update this PR with bumped CI images for the failure to resolve.
/cc @HadrienG2