Merge pull request #109 from planetlabs/fix-gitlab-ci-docker-versiont #420

Job	Run time
test-docker	3m 7s
test-client (3.8, test,queuable,sentry)	32s
test-client (3.9, test)	36s
test-client (3.8, test)	33s
test-client (3.12, test)	31s
test-client (3.10, test)	27s
test-client (3.9, test,queuable,sentry)	35s
test-client (3.12, test,queuable,sentry)	30s
test-client (3.10, test,queuable,sentry)	37s
	7m 28s

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