Create build workflow

.github/workflows/blank.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: build-systems
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the "main" branch
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build_nuOS:
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: do the build
+        run: nixos-rebuild build --flake .#nuOS
+  build_lambdaOS:
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: do the build
+        run: nixos-rebuild build --flake .#lambdaOS
+  build_muOS:
+    runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+      - name: do the build
+        run: nixos-rebuild build --flake .#muOS
+