Add runs-on to the publish_chart job #7121

Job	Run time
docs	30s
gomod	54s
image_tags	1s
test (test)	11m 27s
test (integration-test)	8m 10s
reno_lint	39s
test (helm-test)	3m 14s
lint	3m 29s
build (controller)	2m 25s
build (kanctl)	2m 21s
build (kando)	2m 11s
release	0s
release_example_docker_images	0s
	35m 21s

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