move repo to ghcr.io #284

Job	Run time
push-test-images-for-release	0s
prepare_pgversion_matrix	3s
push-test-images-for-dev (citusupgradetester)	3m 35s
push-test-images-for-dev (pgupgradetester)	2m 31s
push-test-images-for-dev (stylechecker)	49s
push-test-images-for-dev (extbuilder, 14.11)	1m 57s
push-test-images-for-dev (extbuilder, 15.6)	1m 33s
push-test-images-for-dev (extbuilder, 16.2)	1m 45s
push-test-images-for-dev (exttester, 14.11)	3m 55s
push-test-images-for-dev (exttester, 15.6)	3m 18s
push-test-images-for-dev (exttester, 16.2)	4m 20s
push-test-images-for-dev (failtester, 14.11)	1m 52s
push-test-images-for-dev (failtester, 15.6)	1m 53s
push-test-images-for-dev (failtester, 16.2)	1m 52s
	29m 23s

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