[reland] .github: Add initial linux CI workflow (#56280)
Summary:
This reverts commit 6b5ed5ec454ecd8597ff0465305915dd1e09a805.
There'll also probably be fixes here, see diff from original PR: https://github.com/pytorch/pytorch/compare/f2abce0...ci-all/add-initial-linux-ci-gha
Pull Request resolved: https://github.com/pytorch/pytorch/pull/56280
Reviewed By: walterddr
Differential Revision: D27826012
Pulled By: seemethere
fbshipit-source-id: 71cad1d7f840ede5025b1bb4a33d628aa74686d1
