name: Lint and Test Charts

on:
  pull_request:
  push:
    branches:
      - main

jobs:
  lint-test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        # Latest k8s versions. There's no series-based tag, nor is there a latest tag.
        k8s:
          - 1.19.16
          - 1.20.15
          - 1.21.12
          - 1.22.9
          - 1.23.6
          - 1.24.0
    steps:
      - name: Checkout
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Set up Helm
        uses: azure/setup-helm@v1
        with:
          version: v3.8.1

      - uses: actions/setup-python@v2
        with:
          python-version: 3.7

      - name: Set up chart-testing
        uses: helm/chart-testing-action@v2.2.1

      - name: Run chart-testing (list-changed)
        id: list-changed
        run: |
          changed=$(ct list-changed --target-branch ${{ github.event.repository.default_branch }})
          if [[ -n "$changed" ]]; then
            echo "::set-output name=changed::true"
          fi
      - name: Run chart-testing (lint)
        run: ct lint --target-branch ${{ github.event.repository.default_branch }}

      - name: Create kind cluster
        uses: helm/kind-action@v1.2.0
        with:
          version: "v0.13.0"
          node_image: "kindest/node:v${{ matrix.k8s }}"
        # Only build a kind cluster if there are chart changes to test.
        if: steps.list-changed.outputs.changed == 'true'

      - name: Run chart-testing (install)
        run: ct install
        if: steps.list-changed.outputs.changed == 'true'