switch to az cpu kubernetes cluster

.github/workflows/ci.yml

@@ -23,20 +23,10 @@ jobs:
       matrix:
         torch-version: [nightly, stable]
     name: Build and Test (Linux, torch-${{ matrix.torch-version }}, assertions)
-    runs-on: torch-mlir-cpubuilder-manylinux-x86-64
+    runs-on: torch-mlir-cpubuilder-linux-x86-64-scale
     env:
       CACHE_DIR: ${{ github.workspace }}/.container-cache
     steps:
-      - name: Configure local git mirrors
-        run: |
-          # Our stock runners have access to certain local git caches. If these
-          # files are available, it will prime the cache and configure git to
-          # use them. Practically, this eliminates network/latency for cloning
-          # llvm.
-          if [[ -x /gitmirror/scripts/trigger_update_mirrors.sh ]]; then
-            /gitmirror/scripts/trigger_update_mirrors.sh
-            /gitmirror/scripts/git_config.sh
-          fi
       - name: "Checking out repository"
         uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3 # v3.5.0
         with: