Refactor (ci): Use a `job_group_key` to group jobs #110

Job	Run time
build-2-7-0	4m 49s
build-2-8-1	4m 39s
test-nogitdiff	17s
update-draft-release	0s
publish-draft-release	0s
update-dockerhub-description	0s
	9m 45s

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