feat: add hello_world.cpp and related pipeline

Author: Helias

.github/workflows/example2.yml

@@ -0,0 +1,21 @@
+name: build-hello-world
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  build-hello-world:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: install g++
+        run: sudo apt install -y g++
+
+      - name: check build
+        run: |
+          g++ hello_world.cpp -o hello_world
+          ./hello_world

hello_world.cpp

@@ -0,0 +1,9 @@
+#include <iostream>
+using namespace std;
+
+int main() {
+
+  cout << "Hello World" << endl;
+
+  return 0;
+}