Fix release workflow tag lookup with full checkout history

[Copilot]

The run job in the release workflow was failing while generating release notes because the checkout did not include enough history to resolve ${current_tag}^. As a result, git describe could not find the previous tag for tagged releases.

• Root cause

  • Generate Release Notes assumes the tagged commit’s parent is available locally:

    previous_tag=$(git describe --abbrev=0 --match "*" --tags $current_tag^)

  • The workflow was using the default shallow checkout, so tag ancestry was incomplete.

• Change

  • Configure actions/checkout@v5 with full history in .github/workflows/release.yml:

    - uses: actions/checkout@v5
      with:
        fetch-depth: 0

• Effect

  • Makes tag ancestry available during release creation.
  • Allows previous-tag resolution and release note generation to work for tagged builds.