CI: Run py36,pypy27 toxenvs specially #294

Job	Run time
Build, test and push (amd64, py36,pypy27)	1m 32s
Build, test and push (amd64, py39,py310,py311,py312,py313,py314,py315,py314t,py315t,pypy39,pypy31...	1m 39s
Build, test and push (arm64, py312)	1m 33s
Build, test and push (ppc64le, py39,py311)	1m 33s
Build, test and push (s390x, py39,py310,py312)	1m 34s
Update Dockerhub description	0s
Update and test manifests	-1s
	7m 50s

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