ci: add downloads readthedocs #3381

Job	Run time
git_checks	7s
format	32s
linux_el8 (el8, icc, ompi)	42m 38s
linux_el8 (el8, oneapi, ompi)	38m 46s
linux_ubuntu (ubuntu20.04, gcc8, ompi)	29m 23s
linux_ubuntu (ubuntu20.04, gcc9, ompi)	28m 47s
linux_ubuntu (ubuntu20.04, gcc10, ompi)	27m 33s
linux_ubuntu (ubuntu20.04, gcc11, ompi)	27m 15s
linux_ubuntu (ubuntu20.04, clang6, ompi)	28m 4s
linux_ubuntu (ubuntu20.04, clang10, ompi)	28m 7s
linux_ubuntu (ubuntu20.04, gcc10, mpich)	46m 1s
linux_ubuntu (ubuntu20.04, gcc8, serial)	7m 55s
linux_ubuntu (ubuntu20.04, clang6, serial)	7m 32s
windows (win2019, serial)	16m 25s
windows (win2019, ompi)	21m 41s
windows (win2022, serial)	12m 31s
windows (win2022, ompi)	18m 37s
docker (ubuntu-bionic)	13m 14s
macos (macos11, serial)	4m 54s
macos (macos12, serial)	7m 20s
contract (examples)	2m 7s
contract (lammps)	6m 1s
contract (tau)	19m 36s
build_and_test	1s
	7h 15m 7s

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