diff --git a/.gitea/workflows/build.yml b/.gitea/workflows/build.yml
index f10ce93..04f1b0f 100644
--- a/.gitea/workflows/build.yml
+++ b/.gitea/workflows/build.yml
@@ -12,5 +12,7 @@ jobs:
         uses: https://github.com/cachix/install-nix-action@v23
         with:
           github_access_token: ${{ secrets.INPUT_GITHUB_ACCESS_TOKEN }}
+      - name: Stub data files
+        run: touch src/data/day{01..31}.txt
       - name: Build package
         run: nix build