fix the pipeline

.gitea/workflows/build-pdf.yaml

@@ -7,14 +7,29 @@ on:
 jobs:
   build-pdf:
     runs-on: ubuntu-latest
-    container:
-      image: marpteam/marp-cli:latest
-      # env:
-      #   NODE_ENV: development
     
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: latest
+
+      - name: Install Marp CLI
+        run: npm install -g @marp-team/marp-cli
+
+      - name: Install chromium
+        run: sudo apt-get install -y chromium-browser
 
       - name: Build PDF
-        run: npx marp --pdf slides.md
+        run: marp main.md --pdf
+
+      - name: Upload output as artifact
+        uses: https://gitea.com/actions/upload-artifact@v3
+        with:
+          name: presentation
+          path: slide.pdf
+          if-no-files-found: error
+          retention-days: 15