Add export-models workflow for DL3 XNNPACK export

Author: kirklandsign

.github/workflows/export-models.yml

@@ -0,0 +1,46 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree.
+
+name: Export Models
+
+on:
+  schedule:
+    # Run nightly at midnight UTC
+    - cron: '0 0 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  dl3_export:
+    runs-on: ubuntu-latest
+    name: Export DL3 to XNNPACK
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install executorch
+
+      - name: Run export script
+        working-directory: dl3/python
+        run: python export.py
+
+      - name: Upload exported model
+        uses: actions/upload-artifact@v4
+        with:
+          name: dl3-xnnpack-fp32
+          path: dl3/python/dl3_xnnpack_fp32.pte
+          if-no-files-found: error