CI: Add Actions workflow

Author: w1th0utnam3

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: [ "**" ]
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  build-and-test:
+    name: ${{ matrix.os }} / ${{ matrix.build_type }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+        build_type: [Release]
+
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Configure CMake
+        run: |
+          cmake -B build \
+            -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \
+            -DSYMX_ENABLE_DIAGNOSTIC_TESTS=OFF
+
+      - name: Build tests
+        run: cmake --build build --target tests --parallel $(nproc 2>/dev/null || sysctl -n hw.logicalcpu)
+
+      - name: Run tests
+        working-directory: build
+        run: ctest --output-on-failure --build-config ${{ matrix.build_type }}