[Nova] Stylechecks on Nova (#3390)

Summary:
Introducing the stylecheck job on Nova. It seems like it is failing on trunk, but the functionality of this job itself is working and it fails with the same error as it does on trunk with CCI.

Pull Request resolved: https://github.com/pytorch/audio/pull/3390

Reviewed By: mthrok

Differential Revision: D46324223

Pulled By: osalpekar

fbshipit-source-id: 1324202e53569d610559ef6f1b90cb5c364e6909

.github/workflows/stylecheck.yml

+name: Stylecheck
+
+on:
+  pull_request:
+  push:
+    branches:
+      - nightly
+      - main
+      - release/*
+  workflow_dispatch:
+
+jobs:
+  python-source-and-configs:
+    uses: pytorch/test-infra/.github/workflows/linux_job.yml@main
+    with:
+      repository: pytorch/audio
+      docker-image: "pytorch/torchaudio_unittest_base:manylinux"
+      script: |
+        set -euo pipefail
+
+        # Set CHANNEL
+        if [[(${GITHUB_EVENT_NAME} = 'pull_request' && (${GITHUB_BASE_REF} = 'release'*)) || (${GITHUB_REF} = 'refs/heads/release'*) ]]; then
+          export UPLOAD_CHANNEL=test
+        else
+          export UPLOAD_CHANNEL=nightly
+        fi
+
+        .circleci/unittest/linux/scripts/setup_env.sh
+        .circleci/unittest/linux/scripts/run_style_checks.sh