CI: Run py36,pypy27 toxenvs specially #291

Job	Run time
Build, test and push (amd64, py36,pypy27)	1m 33s
Build, test and push (ppc64le, py39,py311)	1m 36s
Build, test and push (s390x, py39,py310,py312)	1m 37s
Build, test and push (amd64, py39,py310,py311,py312,py313,py314,py315,py314t,py315t,pypy39,pypy31...	1m 42s
Build, test and push (arm64, py312)	1m 36s
Update Dockerhub description	-1s
Update and test manifests	-1s
	8m 2s

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