Added CI actions for testing, docs.

.github/workflows/doxygenate.yaml

@@ -0,0 +1,31 @@
+on:
+  push:
+    branches:
+      - master
+
+name: Build documentation
+
+jobs:
+  doxygenator:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Add Pretty CSS
+      uses: wei/wget@v1
+      with:
+        args: -O docs/doxygen-awesome.css https://raw.githubusercontent.com/jothepro/doxygen-awesome-css/main/doxygen-awesome.css
+    - name: Download tagfile
+      uses: wei/wget@v1
+      with:
+        args: -O docs/tatami.tag https://tatami-inc.github.io/tatami/tatami.tag
+    - name: Doxygen Action
+      uses: mattnotmitt/doxygen-action@v1
+      with:
+        working-directory: docs/
+    - name: GH Pages Deployment
+      uses: JamesIves/github-pages-deploy-action@v4
+      with:
+        branch: gh-pages # The branch the action should deploy to.
+        folder: docs/html
+        target-folder: docs/
+        clean: true # Automatically remove deleted files from the deploy branch

.github/workflows/run-tests.yaml

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+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+name: Run unit tests
+
+jobs:
+  build:
+    name: ${{ matrix.config.name }}
+    runs-on: ${{ matrix.config.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+        - {
+            name: "Ubuntu Latest GCC, coverage enabled", 
+            os: ubuntu-latest,
+            cov: true
+          }
+        - {
+            name: "macOS Latest Clang", 
+            os: macos-latest,
+            cov: false
+          }
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Get latest CMake
+      uses: lukka/get-cmake@latest
+
+    - name: Configure the build with coverage
+      if: ${{ matrix.config.cov }}
+      run: cmake -S . -B build -DCODE_COVERAGE=ON
+
+    - name: Configure the build with custom parallelization
+      if: ${{ ! matrix.config.cov }}
+      run: cmake -S . -B build
+
+    - name: Run the build
+      run: cmake --build build
+
+    - name: Run the tests
+      run: |
+        cd build
+        ctest --rerun-failed --output-on-failure
+
+    - name: Generate code coverage
+      if: ${{ matrix.config.cov }}
+      run: |
+        cd build/tests/CMakeFiles/
+        find -type f -name "*.gcno" -execdir gcov -abcfu {} +
+
+    - name: Upload to Codecov
+      if: ${{ matrix.config.cov }}
+      uses: codecov/codecov-action@v4
+      with:
+        directory: build/tests/CMakeFiles/
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}