Add GitHub workflows

Author: currantw

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: Code Quality
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+
+jobs:
+  quality:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python 3.12
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.12"
+
+    - name: Install dependencies
+      run: |
+        npm install -g markdownlint-cli
+        make install-dev
+
+    - name: Run code quality checks
+      run: make check-all
+
+    - name: Test with pytest
+      run: make test-cov
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./.coverage/coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+        fail_ci_if_error: false