fix: use current org's course-metadata instead of hardcoded CS101

Use ${{ github.repository_owner }}/course-metadata to dynamically
determine the metadata repository based on current organization.

.gitea/workflows/autograde.yml

@@ -210,10 +210,11 @@ jobs:
           fi
       
       - name: Upload metadata
-        if: env.RUNNER_METADATA_REPO != '' && env.RUNNER_METADATA_TOKEN != ''
+        if: env.RUNNER_METADATA_TOKEN != ''
         working-directory: ${{ github.workspace }}
         env:
-          METADATA_REPO: ${{ env.RUNNER_METADATA_REPO }}
+          # 使用当前组织的 course-metadata 仓库，而不是 Runner 配置中的硬编码值
+          METADATA_REPO: ${{ github.repository_owner }}/course-metadata
           METADATA_TOKEN: ${{ env.RUNNER_METADATA_TOKEN }}
           METADATA_BRANCH: ${{ env.RUNNER_METADATA_BRANCH }}
           STUDENT_REPO: ${{ github.repository }}