load artifact into docker images when built with dedicated buildx bui… #357

Job	Run time
prepare_pgversion_matrix	4s
push-test-images-for-dev (citusupgradetester)	5m 0s
push-test-images-for-dev (pgupgradetester)	3m 32s
push-test-images-for-release	0s
push-test-images-for-dev (stylechecker)	2m 46s
push-test-images-for-dev (extbuilder, 14.15)	1m 40s
push-test-images-for-dev (extbuilder, 15.10)	1m 35s
push-test-images-for-dev (extbuilder, 16.6)	1m 31s
push-test-images-for-dev (extbuilder, 17.2)	1m 39s
push-test-images-for-dev (exttester, 14.15)	3m 47s
push-test-images-for-dev (exttester, 15.10)	3m 48s
push-test-images-for-dev (exttester, 16.6)	3m 52s
push-test-images-for-dev (exttester, 17.2)	4m 31s
push-test-images-for-dev (failtester, 14.15)	2m 11s
push-test-images-for-dev (failtester, 15.10)	1m 52s
push-test-images-for-dev (failtester, 16.6)	1m 52s
push-test-images-for-dev (failtester, 17.2)	1m 54s
	41m 34s

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