Update continuous integration checks (#169)

* Add GitHub Actions

* Update ci.yml

.github/workflows/ci.yml

@@ -0,0 +1,46 @@
+name: CI
+
+on:
+  push:
+    branches:
+    - src
+  pull_request:
+  workflow_dispatch:
+  schedule:
+  - cron: 37 7 * * 1
+
+jobs:
+  test-build:
+    name: ${{ matrix.name }}
+    runs-on: ubuntu-latest
+
+    strategy:
+
+      matrix:
+        include:
+
+        - name: Build website
+          python: '3.12'
+          nox_session: build
+
+        - name: Perform Nikola checks
+          python: '3.12'
+          nox_session: check
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python }}
+        cache: pip
+
+    - name: Install Nox and uv
+      run: python -m pip install --progress-bar off --upgrade nox uv
+
+    - name: Run Nox session
+      run: nox -s build