Add setup-proxy-cache to test workflows

Co-authored-by: leofang <5534781+leofang@users.noreply.github.com>

Author: Copilot

.github/workflows/test-wheel-linux.yml

@@ -143,6 +143,12 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Setup proxy cache
+        uses: nv-gha-runners/setup-proxy-cache@main
+        continue-on-error: true
+        # Skip the cache on Windows nodes outside of our org.
+        if: ${{ inputs.host-platform != 'win-64' }}
+
       - name: Install dependencies
         uses: ./.github/actions/install_unix_deps
         continue-on-error: false

.github/workflows/test-wheel-windows.yml

@@ -89,6 +89,12 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Setup proxy cache
+        uses: nv-gha-runners/setup-proxy-cache@main
+        continue-on-error: true
+        # Skip the cache on Windows nodes outside of our org.
+        if: ${{ inputs.host-platform != 'win-64' }}
+
       - name: Update driver
         run: |
           .github/workflows/install_gpu_driver.ps1