test: 完善issues_comment时的pr分支获取逻辑

.github/workflows/test-pr.yml

@@ -40,7 +40,21 @@ jobs:
           cd qcg-tester
           python -m pip install --upgrade pip
           pip install -r requirements.txt
+      - name: Get PR details
+        if: github.event_name == 'issue_comment'
+        id: get-pr
+        uses: octokit/request-action@v2.x
+        with:
+          route: GET /repos/${{ github.repository }}/pulls/${{ github.event.issue.number }}
+          mediaType: '{"previews": ["shadow-cat"]}'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set Got PR Branch as bash env
+        if: github.event_name == 'issue_comment'
+        run: |
+          echo "BRANCH=${{ steps.get-pr.outputs.data.head.ref }}" >> $GITHUB_ENV
       - name: Set PR Branch as bash env
+        if: github.event_name != 'issue_comment'
         run: |
           echo "BRANCH=${{ github.head_ref }}" >> $GITHUB_ENV
       - name: Set OpenAI API Key from Secrets