add initial version of github action

Author: CarlosEduR

.github/workflows/c26-build-container.yml

@@ -0,0 +1,28 @@
+name: C++26 Build and Test
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Build Docker image
+        run: |
+          docker build -t cpp26-app .
+
+      - name: Run tests in Docker container
+        run: |
+          docker run --rm cpp26-app /bin/bash -c "cd /workspace && cmake -B build"