fix docker ci master #343

Job	Run time
coq	1m 7s
coq-elpi	1m 50s
hierarchy-builder	1m 36s
mathcomp-ssreflect	3m 43s
autosubst	1m 38s
QuickChick	2m 57s
coquelicot	2m 14s
mathcomp-bigenough	1m 36s
mathcomp-fingroup	2m 21s
mathcomp-finmap	1m 57s
relation-algebra	2m 34s
mathcomp-algebra	4m 40s
interval	4m 4s
mathcomp-solvable	3m 8s
multinomials	2m 29s
mathcomp-classical	3m 10s
mathcomp-field	5m 19s
mathcomp-reals	3m 59s
mathcomp-experimental-reals	2m 15s
mathcomp-reals-stdlib	1m 49s
mathcomp-real-closed	3m 54s
mathcomp-character	3m 9s
mathcomp-analysis	10m 52s
mathcomp	11m 52s
coqeal	13m 55s
mathcomp-analysis-stdlib	14m 5s
odd-order	11m 51s
	2h 4m 4s

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