build(ci): add GitHub actions

Author: mbdevpl

.github/workflows/python.yml

@@ -0,0 +1,35 @@
+name: tests
+
+on:
+  push:
+  pull_request:
+    branches:
+      - $default-branch
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ['3.8', '3.9', '3.10']
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+      - run: pip install -r requirements_ci.txt
+      - run: git clone https://github.com/PyCQA/pycodestyle ../pycodestyle
+      - run: cd ../pycodestyle && python setup.py build && cd -
+      - run: git clone https://github.com/mbdevpl/argunparse ../argunparse
+      - run: cd ../argunparse && pip install -r test_requirements.txt && python setup.py build && cd -
+      - run: git clone https://github.com/python-semver/python-semver ../semver
+      - run: cd ../semver && python setup.py build && cd -
+      - run: python -m coverage run --branch --source . -m unittest -v
+      # - run: LOGGING_LEVEL=critical python -m coverage run --append --branch --source . -m unittest -v test.test_version
+      - run: python -m coverage report --show-missing
+      - run: codecov