install libpq first #341

Job	Run time
push-test-images-for-release	0s
prepare_pgversion_matrix	3s
push-test-images-for-dev (citusupgradetester)	3m 44s
push-test-images-for-dev (pgupgradetester)	2m 54s
push-test-images-for-dev (stylechecker)	2m 22s
push-test-images-for-dev (extbuilder, 14.15)	1m 28s
push-test-images-for-dev (extbuilder, 15.10)	1m 23s
push-test-images-for-dev (extbuilder, 16.6)	1m 25s
push-test-images-for-dev (extbuilder, 17.2)	1m 23s
push-test-images-for-dev (exttester, 14.15)	3m 21s
push-test-images-for-dev (exttester, 15.10)	3m 50s
push-test-images-for-dev (exttester, 16.6)	4m 17s
push-test-images-for-dev (exttester, 17.2)	3m 29s
push-test-images-for-dev (failtester, 14.15)	2m 6s
push-test-images-for-dev (failtester, 15.10)	2m 4s
push-test-images-for-dev (failtester, 16.6)	1m 58s
push-test-images-for-dev (failtester, 17.2)	3m 4s
	38m 51s

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