Add github workflow for continuous testing

Author: birgits

.github/workflows/tests-coverage.yml

@@ -0,0 +1,69 @@
+# Tests with pytest the package and monitors the coverage and sends it to coveralls.io
+# Coverage is only send to coveralls.io when no pytest tests fail
+name: "Tests & Coverage"
+
+on: [push]
+
+# Cancel jobs on new push
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    name: "${{ matrix.name-suffix }} at py${{ matrix.python-version }} on ${{ matrix.os }}"
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - name-suffix: "coverage"
+            os: ubuntu-latest
+            python-version: 3.11
+          - name-suffix: "basic"
+            os: ubuntu-latest
+            python-version: 3.10
+          - name-suffix: "basic"
+            os: ubuntu-latest
+            python-version: 3.12
+          - name-suffix: "basic"
+            os: windows-latest
+            python-version: 3.11
+
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v3
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          python -m pip install --upgrade pip wheel setuptools
+          pip install .[dev]
+
+      - name: Install dependencies (Windows)
+        if: runner.os == 'Windows'
+        uses: conda-incubator/setup-miniconda@v2
+        run:
+          conda create -n testenv python=${{ matrix.python }}
+          conda activate testenv
+          python -m pip install .[dev]
+
+      - name: Run tests
+        if: ${{ !(runner.os == 'Linux' && matrix.python-version == 3.9 && matrix.name-suffix == 'coverage') }}
+        run: |
+          python -m pytest --disable-warnings --color=yes -v
+
+      - name: Run tests, coverage and send to coveralls
+        if: runner.os == 'Linux' && matrix.python-version == 3.9 && matrix.name-suffix == 'coverage'
+        run: |
+          coverage run --source=windpowerlib -m pytest --disable-warnings --color=yes -v
+          coveralls
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          COVERALLS_SERVICE_NAME: github