gitea: build pdf on push

.gitea/workflows/build-pdf.yml

@@ -0,0 +1,35 @@
+name: Build PDF
+
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  pdf:
+    name: make pdf
+    runs-on: ubuntu-latest
+    container:
+      image: golang:1.22-bookworm
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Chromium and tools
+        run: |
+          apt-get update
+          DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+            make chromium ca-certificates fonts-liberation
+          rm -rf /var/lib/apt/lists/*
+
+      - name: Build PDF
+        run: make pdf
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: output-pdf
+          path: _dist/output.pdf
+          if-no-files-found: error
+