ci: run lint / unit tests / docs as GH actions

.github/workflows/blacken.yml

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+name: "Blacken"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  run-blacken:
+    name: blacken
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.8"
+    - name: Install nox
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install nox
+    - name: Run blacken
+      run: |
+        nox -s blacken

.github/workflows/docs.yml

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+name: "Docs"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  run-docs:
+    name: docs
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.8"
+    - name: Install nox
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install nox
+    - name: Run docs
+      run: |
+        nox -s docs

.github/workflows/lint.yml

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+name: "Lint"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  run-lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.8"
+    - name: Install nox
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install nox
+    - name: Run lint
+      run: |
+        nox -s lint
+    - name: Run lint_setup_py
+      run: |
+        nox -s lint_setup_py

.github/workflows/unittest.yml

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+name: "Unit tests"
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  run-unittests:
+    name: unit${{ matrix.option }}-${{ matrix.python }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python:
+          - "3.6"
+          - "3.7"
+          - "3.8"
+          - "3.9"
+          - "3.10"
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python }}
+    - name: Install nox
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install nox
+    - name: Run unit tests
+      env:
+        COVERAGE_FILE: .coverage${{ matrix.option }}-${{matrix.python }}
+      run: |
+        nox -s unit${{ matrix.option }}-${{ matrix.python }}
+    - name: Upload coverage results
+      uses: actions/upload-artifact@v2
+      with:
+        name: coverage-artifacts
+        path: .coverage${{ matrix.option }}-${{ matrix.python }}
+
+  report-coverage:
+    name: cover
+    runs-on: ubuntu-latest
+    needs:
+        - run-unittests
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.10"
+    - name: Install coverage
+      run: |
+        python -m pip install --upgrade setuptools pip wheel
+        python -m pip install coverage
+    - name: Download coverage results
+      uses: actions/download-artifact@v2
+      with:
+        name: coverage-artifacts
+        path: .coverage-results/
+    - name: Report coverage results
+      run: |
+        coverage combine .coverage-results/.coverage*
+        coverage report --show-missing --fail-under=100
+