Adding a GH action to run tests & linting for every commit

Signed-off-by: Cédric Foellmi <cedric@onekiloparsec.dev>

Author: onekiloparsec

.github/workflows/tests.yml

@@ -0,0 +1,66 @@
+name: Run Tests
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [ '3.10', '3.11', '3.12', '3.13' ]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+          pip install pytest pytest-cov
+          pip install -e .
+
+      - name: Test with pytest
+        run: |
+          pytest -xvs tests/ --cov=arcsecond --cov-report=xml
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v3
+        with:
+          file: ./coverage.xml
+          fail_ci_if_error: false
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install flake8 black isort
+
+      - name: Lint with flake8
+        run: |
+          flake8 arcsecond tests --count --select=E9,F63,F7,F82 --show-source --statistics
+
+      - name: Check formatting with black
+        run: |
+          black --check arcsecond tests
+
+      - name: Check imports with isort
+        run: |
+          isort --check-only --profile black arcsecond tests