name: build and publish containers

on:
  push:
    branches:
      - main
  schedule:
    - cron: "0 0 * * 1,3,5"

jobs:
  build:
    runs-on: nixos-latest
    strategy: &strategy
      matrix:
        container: [ nixos ]
        version: [ "24.11", "unstable" ]
    steps:
      - name: pre-requisites
        run: |
          nix-env -iA nixpkgs.docker nixpkgs.nodejs_20 nixpkgs.gnused nixpkgs.coreutils && mkdir -p ~/.config/nix && echo "experimental-features = nix-command flakes" > ~/.config/nix/nix.conf
      - name: checkout
        uses: actions/checkout@v4
        with:
          ref: 'main'
      - name: nix package names
        id: pkgs
        run: |
          echo "pkgs-name=${{ matrix.container }}-${{ matrix.version }}" | tr -d . >>"${GITHUB_OUTPUT}"
      - name: build
        uses: actions/nix/build@main
        with:
          package: ${{ steps.pkgs.outputs.pkgs-name }}
          out-link: ${{ steps.pkgs.outputs.pkgs-name }}
      - name: load image into docker
        run: |
          docker load < ${{ steps.pkg.outputs.pkg-name }}