Revise docs building CI workflow

[pearu]

As in title.

Alternative to #4090

PLEASE NOTE THAT THE TORCHAUDIO REPOSITORY IS NO LONGER ACTIVELY MONITORED. You may not get a response. For open discussions, visit https://discuss.pytorch.org/.

[pytorch-bot]

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[samanklesaria]

Looks good to me!

[NicolasHug]

Thanks @pearu .

I was hoping we could do something much simpler than what torchcodec does: torchcodec builds a wheel separately on the build job, and then installs that wheel separately on the build-docs jobs and builds the docs from there.

This is needed due to specific requirements of torchcodec, but for torchaudio we should be able to do something much simpler: we should be able to just install torchcodec/torch from nightlyies and then build torchaudio and the docs from source on the GH's linux.4xlarge.nvidia.gpu (i.e. one single job instead of 2).

Let's try this simpler approach first? If really that doesn't work, then the current workflow is probably OK, but it should be simplified greatly as a lot of the existing checks are for torchcodec only. I left comments to that effect - but please let's try the simpler approach first. Thanks!

[samanklesaria]

Makes sense to me!

[NicolasHug]

This is great, thank you!