add test workflow (#6)

.editorconfig

@@ -10,3 +10,6 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.yml]
+indent_size = 2

.github/workflows/test.yml

@@ -0,0 +1,32 @@
+name: Build and test
+
+on:
+  push:
+    branches: "**"
+  pull_request:
+    branches: "**"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - uses: seanmiddleditch/gha-setup-ninja@v4
+
+    - name: Install GCC 12
+      run: |
+        sudo apt install -y gcc-12 g++-12
+        sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100
+        sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 100
+
+    - name: Configure CMake
+      run: cmake -B build -G Ninja
+
+    - name: Build
+      run: cmake --build build --parallel
+
+    - name: Test
+      working-directory: build/test
+      run: ctest