ci: add headless build+test workflow for Windows and Linux

Author: LyeZinho

.github/workflows/ci.yml

@@ -0,0 +1,33 @@
+name: CI
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: ['**']
+
+jobs:
+  build-and-test:
+    name: ${{ matrix.config.name }}
+    runs-on: ${{ matrix.config.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        config:
+          - name: "Windows MSVC"
+            os: windows-latest
+          - name: "Ubuntu GCC"
+            os: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Configure CMake (headless — graphics deps not required)
+        run: cmake -B build -DCMAKE_BUILD_TYPE=Debug
+
+      - name: Build
+        run: cmake --build build --config Debug
+
+      - name: Test
+        run: ctest --test-dir build --build-config Debug --output-on-failure