Add the Key4hep workflows. Previous commit: Update pre-commit license…

… year; previous commit: Update license year; previous commit: Note that evtMax setting can be overridden by k4run.

.github/workflows/key4hep-build.yaml

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+# 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: '17 5 * * *'
+
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        build_type: ["release", "nightly"]
+        image: ["alma9", "ubuntu22", "centos7"]
+      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 }}