fix: set GH_REPO for gh release commands

[gounthar]

Summary

Fix gh release commands failing with:

No default remote repository has been set for this directory.
please run gh repo set-default

The github-act-runner (Go-based runner for riscv64) doesn't set
GITHUB_REPOSITORY the same way the official runner does, so gh
can't auto-detect the repo context.

Fix: add job-level env.GH_REPO set to ${{ github.repository }}
in the release job so all gh commands know the target repo.

[gemini-code-assist]

Note

Gemini is unable to generate a summary for this pull request due to the file types involved not being currently supported.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 65cda53 and 7a3b156.

📒 Files selected for processing (1)

• .github/workflows/build-riscv64.yml

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