fix no previous release

[nullable-eth]

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[Copilot]

Pull Request Overview

This PR updates the release workflow to correctly handle cases with no previous tags (first release) and enhances the changelog with a dedicated "Breaking Changes" section.

• Introduce branching logic for first-release vs. subsequent releases in both changes and release jobs
• Default LAST_TAG to empty and detect absence of tags
• Append a “### Breaking Changes” section in changelog.md

Comments suppressed due to low confidence (2)

.github/workflows/release.yml:65

• The logic to detect and initialize a first release is duplicated in both the changes and release jobs. Consider extracting this into a reusable step or composite action to reduce duplication and simplify future maintenance.

          if [[ -z "$LAST_TAG" ]]; then

.github/workflows/release.yml:161

• The "Breaking Changes" section is appended unconditionally. You should wrap this in a condition (e.g., only for major releases or when breaking-change commits exist) to avoid misleading empty sections in minor/patch releases.

            echo "### Breaking Changes" >> changelog.md