Allow running the CI job manually #274

Job	Run time
Build, test and push (amd64, py36,py38,py39,py310,py311,py312,py313,py314,pypy,pypy39,pypy310,pyp...	4m 22s
Build, test and push (ppc64le, py38,py311)	20m 13s
Build, test and push (arm64, py312)	24m 8s
Build, test and push (s390x, py39,py310,py312)	23m 5s
Update and test manifests	3m 11s
Update Dockerhub description	4s
	1h 15m 3s

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