ci: fix CI on main branch

The “Comment PR” step of the test job is executed only when it is not on the main branch, and only the job summary is created when it is on the main branch.

.github/workflows/swift.yml

@@ -46,6 +46,7 @@ jobs:
           SUMMARY: ${{ steps.summary.outputs.SUMMARY }}
         run: echo "$SUMMARY" >> "$GITHUB_STEP_SUMMARY"
       - name: Comment PR
+        if: ${{ github.ref != 'refs/heads/main' }}
         uses: thollander/actions-comment-pull-request@v3
         with:
           message: ${{ steps.summary.outputs.SUMMARY }}