Fix workflow failure when no git tags exist

[vgreg]

Problem

The automated release workflow was failing with:

fatal: ambiguous argument 'v0.0.0..HEAD': unknown revision or path not in the working tree.

This happens because when there are no existing tags in the repository, the script sets LATEST_TAG="v0.0.0" as a fallback, but then tries to use git log v0.0.0..HEAD which fails since the v0.0.0 tag doesn't actually exist.

Solution

Add a check to handle the case when no tags exist:

• If LATEST_TAG is the fallback v0.0.0, get all commits with git log --oneline --pretty=format:"%s"
• Otherwise, use the normal git log ${LATEST_TAG}..HEAD approach

Testing

• Logic validated for repositories with no tags
• Should work for repositories with existing tags
• End-to-end test by merging to main

This should fix the workflow and allow the first automated release to be created successfully.

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