fix: use shell variable in heredoc to avoid YAML parsing error

[evertoncolling]

Summary

• Fix YAML parsing error on line 83 of release workflow
• Replace GitHub Actions expression ${{ github.ref_name }} with shell variable ${GITHUB_REF_NAME} inside heredoc

Context

GitHub Actions expressions inside heredocs cause YAML parsing errors. Using shell environment variables instead resolves this issue.

Test plan

• Workflow will be tested when we recreate the release tag after merging

🤖 Generated with Claude Code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 8.67%. Comparing base (658a6ea) to head (2eabfb7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #10   +/-   ##
=====================================
  Coverage   8.67%   8.67%           
=====================================
  Files          9       9           
  Lines       1314    1314           
=====================================
  Hits         114     114           
  Misses      1198    1198           
  Partials       2       2           

Flag	Coverage Δ
unittests	8.67% <ø> (ø)

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