Declare universe variables in Context commands #1632

Job	Run time
nix	3m 54s
quick-build (supported, ubuntu-latest)	4m 37s
opam-build (supported, ubuntu-latest)	5m 19s
quick-build (latest, ubuntu-latest)	3m 34s
build (supported)	4m 48s
opam-build (8.17, ubuntu-latest)	5m 16s
quick-build (dev, ubuntu-latest)	4m 32s
build (latest)	3m 41s
opam-build (latest, ubuntu-latest)	5m 7s
build (dev, --warnings)	3m 59s
opam-build (dev, ubuntu-latest)	5m 14s
doc-coqdoc	1m 7s
doc-alectryon	20m 12s
coqchk (supported)	1m 47s
doc-dep-graphs	11m 14s
coqchk (latest)	1m 44s
doc-timing	1m 17s
install (supported)	1m 14s
coqchk (dev)	1m 50s
install (latest)	1m 20s
install (dev)	1m 14s
deploy-doc	0s
delete-artifacts	4s
	1h 33m 4s

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