[ci] Add workflow to cache NVIDIA dependencies

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

Author: Breakthrough

.github/workflows/cache_nvidia_deps.yml

@@ -0,0 +1,38 @@
+# Simple workflow to cache NVIDIA dependencies
+# Run this once to populate the cache, then disable or delete
+
+name: Cache NVIDIA Dependencies
+
+on:
+  workflow_dispatch:
+
+jobs:
+  cache-deps:
+    runs-on: windows-2025
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+      with:
+        submodules: false
+        fetch-depth: 1
+    - name: Cache NVIDIA dependencies
+      id: cache-nvidia-deps
+      uses: actions/cache@v3
+      with:
+        path: .deps/Nvidia
+        key: nvidia-deps-cuda-13.1.1-cudnn-9.18.1.3
+    - name: Clone NVIDIA dependencies
+      if: steps.cache-nvidia-deps.outputs.cache-hit != 'true'
+      env:
+        SSH_PRIVATE_KEY: ${{ secrets.DEPS_REPO_SSH_KEY }}
+      run: |
+        eval "$(ssh-agent -s)"
+        ssh-add - <<< "${SSH_PRIVATE_KEY}"
+        ssh-keyscan github.com >> ~/.ssh/known_hosts 2>/dev/null
+        git clone git@github.com:Breakthrough/opencv-python-cuda-deps.git .deps
+      shell: bash
+    - name: Cache populated
+      run: |
+        echo "NVIDIA dependencies cached successfully!"
+        ls -la .deps/Nvidia/ || echo "Cache was already populated"
+      shell: bash