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use the regclient GH action to install regctl #2145

Job	Run time
validate-helm-values	29s
helm-lint	7s
validate-csv	31s
unit tests	33s
go-check	2m 16s
go-build	1m 43s
coverage	1m 7s
build-gpu-operator-arm64	2m 17s
build-gpu-operator-amd64	2m 11s
build-multi-arch-images	13s
e2e-tests-containerd	51m 53s
e2e-tests-nvidiadriver	34m 45s
release-latest-gpu-operator-image	0s
push-gpu-operator-bundle-image	0s
	1h 38m 5s