fix: specify repo in release notes workflow

[phatpham9]

Summary

Fix the CD workflow failure in the update-release-notes job by making all gh release commands target the repository explicitly.

Root cause

The failing run was:

• https://github.com/boringcode-dev/feedreader/actions/runs/27913205289

The update-release-notes job does not check out the repository, but it was running gh release view/create/edit without --repo.

In that environment, gh tried to resolve the repository through local git state and failed with:

failed to run git: fatal: not a git repository (or any of the parent directories): .git

What changed

• set GH_REPO: ${{ github.repository }} in the update-release-notes job steps
• add --repo "$GH_REPO" to:
  • gh release view
  • gh release create
  • gh release edit
• update the inline Python helper to pass the repo explicitly when reading the existing release body

Verification

• validated .github/workflows/cd.yml parses as YAML after the change
• inspected the diff to confirm the fix is limited to the explicit repo plumbing for gh