Add workflow for reference resource generation

.github/workflows/reference_resources.yaml

@@ -0,0 +1,52 @@
+name: Reference resource generation tests
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - test/generate_reference_resources.sh
+  schedule:
+    - cron: '0 0 * * 0'  # on sunday
+
+defaults:
+  run:
+    shell: bash -l -eo pipefail {0}
+
+jobs:
+  test-reference-resource-generation:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.9']
+        ffmpeg-version-for-tests: ['4.4.2', '5.1.2', '6.1.1', '7.0.1']
+    steps:
+      - name: Setup conda env
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+          auto-update-conda: true
+          miniconda-version: "latest"
+          activate-environment: test
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install ffmpeg
+        run: |
+          conda install "ffmpeg=${{ matrix.ffmpeg-version-for-tests }}" -c conda-forge
+          ffmpeg -version
+
+      - name: Update pip
+        run: python -m pip install --upgrade pip
+
+      - name: Instal generation dependencies
+        run: |
+          # Note that we're installing stable - this is for running a script where we're a normal PyTorch
+          # user, not for building TorhCodec.
+          python -m pip install torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu
+          python -m pip install numpy pillow
+
+      - name: Check out repo
+        uses: actions/checkout@v3
+
+      - name: Run generation reference resources
+        run: |
+          test/generate_reference_resources.sh