Enable doc upload for tags, disable for release branches

[pytorchbot]

• Disabled doc upload for branches like release/x.x
• Enabled publishing for tags.

Tested locally:

export GITHUB_REF=refs/tags/v3.1.4-rc5
bash test-version.py

# test-version.py
if [[ "${GITHUB_REF}" =~ ^refs/tags/v([0-9]+\.[0-9]+)\.* ]]; then
  TARGET_FOLDER="${BASH_REMATCH[1]}"
else
  TARGET_FOLDER="main"
fi
echo "Target folder: ${TARGET_FOLDER}"

Output:

Target folder: 3.1

One more:

export GITHUB_REF=refs/tags/v1.15.4
bash test-version.sh

Output:

Target folder: 1.15

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/3243

• 📄 Preview Python docs built from this PR

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✅ No Failures

As of commit e37f0fd with merge base d3326a2 ():
💚 Looks good so far! There are no failures yet. 💚

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