fix: use github token fallback in release workflows

[namastex888]

Summary

• fix release workflow auth fallback to use the built-in github.token context instead of nonexistent secrets.GITHUB_TOKEN
• apply the same fallback in auto-release checkout/tag push env and release GoReleaser checkout/env

Root cause

actions/checkout received an empty token when RELEASE_PLEASE_TOKEN was not configured because secrets.GITHUB_TOKEN is not a real secret. The fetch then fell back to unauthenticated HTTPS and failed with could not read Username for 'https://github.com': terminal prompts disabled.

Verification

• Parsed .github/workflows/auto-release.yml and .github/workflows/release.yml with PyYAML
• Diff is workflow-only

[gemini-code-assist]

Note

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: bb000319-d9a5-4845-b3db-92065d36187a

📥 Commits

Reviewing files that changed from the base of the PR and between 40955fe and 1ea53b6.

📒 Files selected for processing (2)

• .github/workflows/auto-release.yml
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/auto-release-token

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