ci : Build on Github-hosted arm64 runners (ggml-org#12009)

Author: Rohanjames1997

.github/workflows/build.yml

@@ -173,7 +173,10 @@ jobs:
           name: llama-bin-macos-x64.zip
 
   ubuntu-cpu-cmake:
-    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        os: [ubuntu-22.04, ubuntu-22.04-arm]
+    runs-on: ${{ matrix.os }}
 
     steps:
       - name: Clone