Add CI workflow files

.github/workflows/format.yml

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+name: Format
+
+on: [push, pull_request]
+
+jobs:
+
+  format:
+
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+      - uses: psf/black@stable
+        with:
+          args: ". --check"

.github/workflows/lint.yml

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+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+
+  lint:
+
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v4
+
+      - name: Lint
+        run: |
+          pip install flake8
+          flake8 .

.github/workflows/test.yml

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+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  build-and-test:
+
+    if:
+      github.event_name == 'push' || github.event.pull_request.head.repo.full_name !=
+      github.repository
+
+    runs-on: ${{ matrix.os }}
+
+    defaults:
+      run:
+        shell: bash -l {0}
+
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ["3.9"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          miniforge-variant: Miniforge3
+          miniforge-version: latest
+          auto-update-conda: true
+
+      - name: Install dependencies
+        run: |
+          pip install -r requirements.txt
+
+      - name: Install package
+        run: |
+          pip install -e .
+
+      - name: Test
+        run: |
+          pytest -vvv