Linux CPU job should respect set Python version

[osalpekar]

Reintroduce a conda environment within which we will do all deps installation, audio builds, and tests runs. This conda environment will use the python version set by the GHA job - previously this just defaulted to using the system 3.10 python which was default inside the container.

[pytorch-bot]

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❌ 1 New Failure

As of commit 158894c:

NEW FAILURE - The following job has failed:

• build (3.8) (gh)

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[facebook-github-bot]

@osalpekar has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[mthrok]

Looks good on Linux side

https://github.com/pytorch/audio/actions/runs/5536182084/jobs/10103496032?pr=3477#step:10:6890
https://github.com/pytorch/audio/actions/runs/5536182084/jobs/10103496282?pr=3477#step:10:6831
https://github.com/pytorch/audio/actions/runs/5536182084/jobs/10103495845?pr=3477#step:10:6445

However, now the macOS job seems to be failing due to this change...

https://github.com/pytorch/audio/actions/runs/5536182078/jobs/10103495640

Do you have an idea why? I wonder if macOS image has conda installed in a different location than this

eval "$(/opt/conda/bin/conda shell.bash hook)"
https://github.com/pytorch/audio/blob/main/.github/scripts/unittest-linux/run_test.sh#L5C1-L6C1

[facebook-github-bot]

@osalpekar has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[mthrok]

Beautiful. Thank you!

[facebook-github-bot]

@osalpekar merged this pull request in 86cb1e0.

[github-actions]

Hey @osalpekar.
You merged this PR, but labels were not properly added. Please add a primary and secondary label (See https://github.com/pytorch/audio/blob/main/.github/process_commit.py).

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