CI: Publish stable book before master (#8621)

.github/workflows/gh-pages.yml

@@ -26,16 +26,16 @@ jobs:
           OUTDIR=$(basename ${{ github.ref }})
           echo "OUTDIR=$OUTDIR" >> $GITHUB_ENV
 
-      - name: Deploy
+      - name: Deploy stable
         uses: peaceiris/actions-gh-pages@v3
+        if: startswith(github.ref, 'refs/tags/')
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./book/book
-          destination_dir: ./${{ env.OUTDIR }}
 
-      - name: Deploy stable
+      - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
-        if: startswith(github.ref, 'refs/tags/')
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           publish_dir: ./book/book
+          destination_dir: ./${{ env.OUTDIR }}