Fix Ubuntu CI: ignore apt-get update failures from third-party repos

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -111,13 +111,17 @@ jobs:
         run: |
           # Use sudo if available, otherwise run directly (for root/container environments)
           if command -v sudo &> /dev/null; then
-            sudo apt-get update
-            sudo apt-get install -y build-essential libgl1-mesa-dev zlib1g-dev
+            SUDO="sudo"
           else
-            apt-get update
-            apt-get install -y build-essential libgl1-mesa-dev zlib1g-dev
+            SUDO=""
           fi
 
+          # Update package lists (ignore failures from third-party repos)
+          $SUDO apt-get update || true
+
+          # Install build dependencies
+          $SUDO apt-get install -y build-essential libgl1-mesa-dev zlib1g-dev
+
       - name: Build
         shell: bash
         run: |