CI: Setup GitHub Actions

.github/workflows/c-cpp.yml

@@ -0,0 +1,19 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: install packages
+      run: sudo apt-get install -y flex
+    - name: build the app
+      run: mkdir build && cd build && cmake .. && cmake --build .