diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 42529aa..b6ca7b6 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -17,6 +17,8 @@ jobs:
       - name: Execute a shell script
         run: |
           ls ${{ github.workspace }}
+          cd slides
+          ./build.sh once
       - run: echo "🍏 This job's status is ${{ job.status }}."
   Second-step:
     runs-on: ubuntu-latest