add region label to operational metrics (#835) #6

Job	Run time
tag-and-goreleaser	3m 59s
build-and-export-digest (ubuntu-24.04-arm, linux/arm64)	3m 29s
build-and-export-digest (ubuntu-24.04, linux/amd64)	3m 58s
push-manifest	53s
deploy	35s
	12m 54s

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