Run commands without a GPU

[zeke]

The problem

I'm working on a GitHub Actions workflow to cog push a model to Replicate. Part of the release process includes running a script to download weights:

cog run script/download-weights

Unfortunately that script can't be run in the Actions workflow, because GitHub's hosted runners don't (yet?) have GPUs, and this model has gpu: true set in it's cog.yaml file. But there isn't anything in the download-weights script that specifically requires a GPU to run. The current workaround is to approximate the Cog environment by manually installing Python, installing Python dependencies, etc, but that's a pain.

A possible solution

It would be nice to be able to run one-off cog commands and somehow specify that the GPU is not needed:

cog run script/download-weights --no-gpu-needed-thanks

[bfirsh]

Builds work without a gpu. There's logic that can be reused there.

[anotherjesse]

being able to build and test on a mac seems like it is an issue hitting some folks on discord

[bfirsh]

Dupe #590