build.yml

name: Build k3s
on:
  schedule:
    - cron: '0 0 * * *'
  workflow_dispatch:
    inputs:
      version:
        description: 'The version of K3S to build an image for, e.g. v1.29.0+k3s1'
        required: false 
        type: string

jobs:
  build:
    runs-on: ubuntu-latest

    permissions:
      contents: 'write'
      id-token: 'write'

    steps:
      - id: latest-k3s
        uses: pozetroninc/github-action-get-latest-release@v0.7.0
        with:
          owner: k3s-io
          repo: k3s
          excludes: prerelease, draft

      - id: k3s-version
        run: |
          echo "release=${{ (github.event.inputs.version != '') && github.event.inputs.version || steps.latest-k3s.outputs.release }}" >> $GITHUB_OUTPUT

      - id: tag-exists
        uses: mukunku/tag-exists-action@v1.5.0
        with: 
          tag: ${{ steps.k3s-version.outputs.release }}

      - uses: actions/checkout@v2
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}

      - name: Authenticate
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}
        uses: 'google-github-actions/auth@v2'
        with:
          project_id: instruqt
          credentials_json: ${{ secrets.GOOGLE_CLOUD_SERVICE_ACCOUNT }}
          
      - name: Setup `packer`
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}
        uses: hashicorp/setup-packer@main
        id: setup

      - name: Init
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}
        id: init
        run: "packer init k3s.pkr.hcl"

      - name: Validate
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}
        id: validate
        run: "packer validate \
          -var 'project_id=${{vars.PROJECT_ID}}' \
          -var 'k3s_version=${{ steps.k3s-version.outputs.release }}' \
          k3s.pkr.hcl"

      - name: Build
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}
        run: |
          packer build -on-error=abort -color=false \
            -var 'project_id=${{vars.PROJECT_ID}}' \
            -var 'k3s_version=${{ steps.k3s-version.outputs.release }}' \
            k3s.pkr.hcl
          
      - name: Tag
        if: ${{ steps.tag-exists.outputs.exists == 'false' }}
        uses: tvdias/github-tagger@v0.0.1
        with:
          repo-token: ${{ secrets.GITHUB_TOKEN }}
          tag: ${{ steps.k3s-version.outputs.release }}