gitea workflow: try non ubuntu chrome

.gitea/workflows/build-pdf.yml

@@ -21,22 +21,30 @@ jobs:
           check-latest: true
           cache: true
 
-      - name: Install Chromium and tools
+      - name: Install Chrome and tools (no snap)
         run: |
           set -euxo pipefail
           if command -v sudo >/dev/null 2>&1; then SUDO=sudo; else SUDO=; fi
           $SUDO apt-get update
-          # Prefer chromium if available via apt (Debian/Ubuntu variants); fall back to chromium-browser if needed
-          if apt-cache show chromium >/dev/null 2>&1; then
-            DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y --no-install-recommends \
-              make chromium ca-certificates fonts-liberation
-          else
-            DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y --no-install-recommends \
-              make chromium-browser ca-certificates fonts-liberation || true
-          fi
+          # Base tools and fonts
+          DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y --no-install-recommends \
+            ca-certificates gnupg make fonts-liberation
+
+          # Add Google's official Chrome APT repo (avoids Ubuntu's snap-only chromium)
+          $SUDO install -d -m 0755 /etc/apt/keyrings
+          curl -fsSL https://dl.google.com/linux/linux_signing_key.pub | $SUDO gpg --dearmor -o /etc/apt/keyrings/google-linux-signing-keyring.gpg
+          echo "deb [arch=amd64 signed-by=/etc/apt/keyrings/google-linux-signing-keyring.gpg] https://dl.google.com/linux/chrome/deb/ stable main" | \
+            $SUDO tee /etc/apt/sources.list.d/google-chrome.list >/dev/null
+          $SUDO apt-get update
+          DEBIAN_FRONTEND=noninteractive $SUDO apt-get install -y --no-install-recommends google-chrome-stable
+
+          # Clean up apt lists to keep image lean
           $SUDO rm -rf /var/lib/apt/lists/*
 
       - name: Build PDF
+        env:
+          # Ensure our tools pick Chrome first if multiple are present
+          CHROME_PATH: /usr/bin/google-chrome-stable
         run: make pdf
 
       - name: Upload artifact