Refactor (ci): Use a `job_group_key` to group jobs #343

Job	Run time
build-1-16-15	55s
build-1-17-17	54s
build-1-15-12	1m 5s
build-1-14-10	55s
build-1-19-16	53s
build-1-20-15	1m 13s
build-1-18-20	56s
build-1-21-14	1m 19s
build-1-22-17	1m 26s
build-1-23-17	1m 2s
build-1-24-17	1m 19s
build-1-25-14	1m 4s
build-1-26-9	1m 17s
build-1-27-6	56s
build-1-28-2	57s
test-nogitdiff	21s
update-dockerhub-description	0s
publish-draft-release	0s
update-draft-release	0s
	16m 32s

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