Add the key4hep-build workflow

.github/workflows/key4hep-build.yaml

@@ -0,0 +1,36 @@
+# Do not edit this file, it will be overwritten!
+# The template file can be found in
+# https://github.com/key4hep/key4hep-actions/blob/main/workflows/key4hep-build.yaml
+name: Key4hep build
+
+on:
+  push:
+    branches:
+    - main
+  pull_request:
+  workflow_dispatch:
+  schedule:
+        - cron: '16 4 * * *'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        build_type: ["release", "nightly"]
+        image: ["alma9", "ubuntu22"]
+        include:
+          - build_type: nightly
+            image: alma9
+            compiler: gcc11
+      fail-fast: false
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: key4hep/key4hep-actions/key4hep-build@main
+      with:
+        build_type: ${{ matrix.build_type }}
+        image: ${{ matrix.image }}