build_iso.yml

name: Build and Tag ISO

on:
  push:
    branches:
      - main

jobs:
  build-iso:
    if: startsWith(github.event.head_commit.message, 'build-iso')
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Code
        uses: actions/checkout@v4

      - name: Generate Tag Name
        run: |
          echo "TAG_NAME=$(date +"iso-%Y%m%d-%H%M%S")" >> $GITHUB_ENV

      - name: Install Nix
        uses: cachix/install-nix-action@v31
        with:
          nix_path: nixpkgs=channel:nixos-unstable
          extra_nix_config: |
            experimental-features = nix-command flakes

      - name: Build ISO
        run: |
          ISO_PATH=$(NIX_BUILD_CORES=$(nproc) nix run nixpkgs#nixos-generators --accept-flake-config -- --format iso --flake .#nixiso -o result)
          echo "$ISO_PATH : $(du -h $ISO_PATH)"

          echo $ISO_PATh > iso_path

          split $ISO_PATH -b 1900000000 ISO_PART_

          for PART in ISO_PART_*; do
            sha256sum $PART > "sha256_${PART}"
          done

      - name: Create Release
        uses: softprops/action-gh-release@v2
        with:
          prerelease: true
          name: ${{ env.TAG_NAME }}
          tag_name: ${{ env.TAG_NAME }}
          files: |
            ISO_PART_*
            sha256_*