Update docker/build-push-action action to v6 #1496

Job	Run time
run-e2e-tests / e2e	4m 15s
build-dev-container / build-client	12s
build-dev-container / build-server	11s
run-tests / build	3m 34s
deploy-dev-container / deploy	30d 0h 0m 0s
	30d 0h 8m 12s

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