Add github actions with basic CI

.github/workflows/learn-github-actions.yml

@@ -0,0 +1,26 @@
+name: Build
+on:
+  push:
+jobs:
+  build-project:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        build-tool: [Unix Makefiles, Ninja]
+        compiler: [g++, clang++]
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v3.5.3
+
+      - name: Configure the project
+        uses: threeal/cmake-action@v1.2.0
+        with:
+          build-dir: submodules/out
+          generator: ${{ matrix.build-tool }}
+          cxx-compiler: ${{ matrix.compiler }}
+
+      - name: Build the project
+        run: cmake --build build
+
+      - name: Test the project
+        run: ctest --test-dir build

README.md

@@ -28,6 +28,7 @@ Check commits one-by-one as they:
 1. start with not using CMake at all and building the thing using plain g++,
 1. use the simplest CMake 
 1. Hide the growing complexity to Makefile
+1. Adds configure, build and test to GitHub pipeline.
 
 ### TODO