👷 Add linting workflow

.github/workflows/dummy.yml

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+name: Dummy workflow
+
+on:
+  workflow_dispatch:
+
+jobs:
+  dummy:
+    runs-on: ubuntu-latest
+    steps:
+      - run: env | grep ^GITHUB
+      - run: echo $GITHUB_REF

.github/workflows/lint.yml

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+name: Linter & formatter
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  ruff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run linter
+        uses: chartboost/ruff-action@v1
+        with:
+          args: check
+      - name: Run formatter
+        uses: chartboost/ruff-action@v1
+        with:
+          args: format --check

.github/workflows/test.yml

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+name: Package tests
+
+on:
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.10"]
+        torch-version: ["1.12", "2.0"]
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip setuptools
+          pip install pytest
+          pip install torch==${{ matrix.torch-version }} --extra-index-url https://download.pytorch.org/whl/cpu
+          pip install .
+      - name: Test with pytest
+        run: pytest tests