Fix invalid previous_tag parameter in release workflow

[Copilot]

The release workflow fails when creating GitHub releases with HTTP 400: Invalid previous_tag parameter. Root cause: git describe --tags --abbrev=0 HEAD^ unreliably finds the previous tag on parent commit, often returning empty values.

Changes

Replace tag lookup with version-sorted filtering:

- PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")
+ CURRENT_TAG="v${VERSION}"
+ PREV_TAG=$(git tag -l 'v*' --sort=-version:refname | grep -v "^${CURRENT_TAG}$" | grep -v "^latest$" | head -n 1)

This approach:

• Sorts all v* tags by semantic version (descending)
• Excludes current release and latest tags
• Returns most recent previous release
• Handles first release (no previous tag) correctly

Added debug output for troubleshooting:

echo "Current tag: ${CURRENT_TAG}"
echo "Previous tag: ${PREV_TAG}"

Original prompt

Fix the failing GitHub Actions workflow Create GitHub Release
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 63754434722
Job URL: https://github.com/copilot-community-sdk/copilot-sdk-java/actions/runs/22063304621/job/63754434722

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