fix(workflows): use GITHUB_TOKEN as fallback in scheduled triage (#102)

The scheduled issue triage workflow is designed to use a generated
GitHub App token. If the "Generate GitHub App Token" step is skipped,
the workflow would fail because the GITHUB_TOKEN environment variable
would
  be empty.

Author: galz10

.github/workflows/gemini-issue-scheduled-triage.yml

@@ -69,7 +69,7 @@ jobs:
         uses: './'
         id: 'gemini_issue_triage'
         env:
-          GITHUB_TOKEN: '${{ steps.generate_token.outputs.token }}'
+          GITHUB_TOKEN: '${{ steps.generate_token.outputs.token || secrets.GITHUB_TOKEN }}'
           ISSUES_TO_TRIAGE: '${{ steps.find_issues.outputs.issues_to_triage }}'
           REPOSITORY: '${{ github.repository }}'
         with:

examples/workflows/issue-triage/gemini-issue-scheduled-triage.yml

@@ -69,7 +69,7 @@ jobs:
         uses: 'google-github-actions/run-gemini-cli@v0'
         id: 'gemini_issue_triage'
         env:
-          GITHUB_TOKEN: '${{ steps.generate_token.outputs.token }}'
+          GITHUB_TOKEN: '${{ steps.generate_token.outputs.token || secrets.GITHUB_TOKEN }}'
           ISSUES_TO_TRIAGE: '${{ steps.find_issues.outputs.issues_to_triage }}'
           REPOSITORY: '${{ github.repository }}'
         with: