Run CI on onnx-weekly package

.github/workflows/nightly.yml

@@ -0,0 +1,40 @@
+name: Nightly CI on onnx-weekly
+
+on:
+  schedule:
+    - cron: "0 5 * * *"
+  push:
+    paths:
+      - ".github/workflows/nightly.yml"
+
+defaults:
+  run:
+    shell: bash -el {0}
+
+jobs:
+  tests:
+    name: "Linux - unit tests - ${{ matrix.OS }} - Python ${{ matrix.PYTHON_VERSION }}"
+    runs-on: ${{ matrix.OS }}
+    env:
+      CI: True
+    strategy:
+      fail-fast: true
+      matrix:
+        OS: ["ubuntu-latest"]
+        PYTHON_VERSION: ['3.12' ]
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.head_ref }}
+      - uses: mamba-org/setup-micromamba@v1 
+        with:
+          environment-file: environment.yml
+          create-args: >-
+            python=${{ matrix.PYTHON_VERSION }}
+      - name: Run unit tests
+        shell: bash -l {0}
+        run: |
+          pip install onnx-weekly --pre
+          pip install .
+          pytest