fix: Fix CI cross-compile dependency installation

Co-authored-by: aider (gemini/gemini-2.5-pro-preview-05-06) <aider@aider.chat>

.github/workflows/build.yml

@@ -16,7 +16,7 @@ env:
 jobs:
   build:
     name: Build for aarch64
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
 
@@ -28,6 +28,10 @@ jobs:
       - name: Install cross-compilation dependencies
         run: |
           sudo dpkg --add-architecture arm64
+          # Add arm64-specific sources to avoid 404 errors on security repos
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports jammy main restricted universe multiverse" | sudo tee /etc/apt/sources.list.d/arm64.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports jammy-updates main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/arm64.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports jammy-security main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/arm64.list
           sudo apt-get update -y
           # Install build tools and cross-compilation libraries.
           # cmake is included as it's in setup.sh and might be needed by a dependency.