ci: Fix cudatoolkit issue, make docker builds testable
nightly docker builds were failing due to cudatoolkit=11.3.0 not
actually being available using conda.
This remedies that and adds the ability to actually test this workflow
in a pull request
Signed-off-by: Eli Uriegas <eliuriegasfb.com>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/73974
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Approved by: https://github.com/malfet, https://github.com/janeyx99
