Fix ff vacuum #2552

Job	Run time
xmllint-before-build	18s
list-detector-configs	4s
build (gcc, g++)	3m 6s
build (clang, clang++)	2m 23s
check-geometry-configs	2m 33s
check-tracking-geometry	6m 21s
xmllint-after-build	18s
convert-to-gdml	48s
check-geometry-full	0s
check-overlap-geant4 (epic_brycecanyon)	2m 31s
check-overlap-geant4 (epic_craterlake)	1m 35s
check-overlap-geant4-fast (epic_inner_detector)	6m 21s
check-overlap-geant4-fast (epic_brycecanyon)	3m 13s
check-overlap-geant4-fast (epic_craterlake)	1m 34s
check-overlap-tgeo (m, epic_brycecanyon)	1m 3s
check-overlap-tgeo (m, epic_craterlake)	1m 21s
convert-to-tgeo	1m 12s
dump-constants (epic_brycecanyon)	1m 9s
dump-constants (epic_craterlake)	59s
dump-parameter-table (epic_brycecanyon)	1m 21s
dump-parameter-table (epic_craterlake)	1m 23s
generate-prim-file (epic_brycecanyon)	1m 33s
generate-prim-file (epic_craterlake)	1m 37s
trigger-geoviewer	4s
dawn-view-slices	0s
dawn-view	0s
build-artifacts-page	0s
deploy-artifacts-page	0s
trigger-detector-benchmarks	1s
	42m 48s

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