Add Github Actions CI (#1)

Author: dcherian

.github/workflows/ci.yaml

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+name: CI
+on:
+  push:
+    branches:
+      - "*"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  build:
+    name: Build (${{ matrix.python-version }}, ${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ["ubuntu-latest"]
+        python-version: ["3.6", "3.7", "3.8"]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Cache conda
+        uses: actions/cache@v1
+        env:
+          # Increase this value to reset cache if ci/environment.yml has not changed
+          CACHE_NUMBER: 0
+        with:
+          path: ~/conda_pkgs_dir
+          key: ${{ runner.os }}-conda-${{ env.CACHE_NUMBER }}-${{ hashFiles('ci/environment.yml') }}
+      - uses: goanpeca/setup-miniconda@v1
+        with:
+          activate-environment: cf_xarray_test # Defined in ci/environment.yml
+          auto-update-conda: false
+          python-version: ${{ matrix.python-version }}
+          environment-file: ci/environment.yml
+          use-only-tar-bz2: true # IMPORTANT: This needs to be set for caching to work properly!
+      - name: Set up conda environment
+        shell: bash -l {0}
+        run: |
+          python -m pip install -e .
+          conda list
+
+      - name: Run Tests
+        shell: bash -l {0}
+        run: |
+          pytest --cov=./ --cov-report=xml
+
+      - name: Upload code coverage to Codecov
+        uses: codecov/codecov-action@v1
+        with:
+          file: ./coverage.xml
+          flags: unittests
+          env_vars: OS,PYTHON
+          name: codecov-umbrella
+          fail_ci_if_error: false

.github/workflows/linting.yaml

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+name: code-style
+
+on:
+  push:
+    branches: "*"
+  pull_request:
+    branches: master
+
+
+
+jobs:
+
+  lint-black:
+    name: black-formatter
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - name: Install Black
+        run: |
+          python -m pip install black
+      - name: Black Code Formatter
+        run: |
+          black --check --line-length 100 --skip-string-normalization .
+
+  lint-flake8:
+    name: flake8
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - name: Install Flake8
+        run: |
+          python -m pip install flake8
+      - name: Flake8 check
+        run: |
+          flake8 .
+
+  lint-isort:
+    name: isort
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v1
+        with:
+          python-version: 3.8
+      - name: Install isort
+        run: |
+          python -m pip install isort
+      - name: isort check
+        run: |
+          isort --recursive --check-only .

.github/workflows/pypi.yaml

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+name: Upload Package to PyPI
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up Python
+        uses: actions/setup-python@v1
+        with:
+          python-version: '3.x'
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools setuptools-scm wheel twine
+      - name: Build and publish
+        env:
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        run: |
+          python setup.py sdist bdist_wheel
+          twine upload dist/*