Fix release job

Author: noahp

.github/workflows/build.yml

@@ -108,6 +108,10 @@ jobs:
     if: github.event_name == 'create' && github.event.ref_type == 'tag'
 
     steps:
+    # checkout the repo: convenient when creating the release
+    - name: Checkout code
+      uses: actions/checkout@v4
+
     - name: Download all artifacts
       uses: actions/download-artifact@v4
       with: