Fix Tina build... again

Author: nightsh

.github/workflows/jekyll.yml

@@ -66,7 +66,7 @@ jobs:
           key: ${{ runner.os }}-tina-${{ hashFiles('.tina/config.js') }}
       - name: Build Tina CMS
         if: steps.cache_tinacms_restore.outputs.cache-hit != 'true'
-        run: npx tinacms@1.2.1 build
+        run: npm run build
 
       - name: Build Jekyll
         env: