ci: build blog example with -autofree

.github/workflows/ci.yml

@@ -280,6 +280,7 @@ jobs:
       - name: Build examples with -autofree
         run: |
           ./v -autofree -o tetris examples/tetris/tetris.v
+          ./v -autofree -o blog tutorials/building_a_simple_web_blog_with_vweb/code/blog
       - name: v doctor
         run: |
           ./v doctor