name: Create PR to release updated oncall Helm chart

on:
  push:
    tags:
      - "v[0-9]+.[0-9]+.[0-9]+"
jobs:
  update-helm-chart-versions:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Define app_version and helm version
        id: tags
        run: |
          # Strip git ref prefix from version
          APP_VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
          # Strip "v" prefix from tag name
          [[ "${{ github.ref }}" == "refs/tags/"* ]] && HELM_VERSION=$(echo $APP_VERSION | sed -e 's/^v//')
          echo "::set-output name=app_version::$APP_VERSION"
          echo "::set-output name=helm_version::$HELM_VERSION"

      - name: Update oncall Helm chart Chart.yaml
        uses: fjogeleit/yaml-update-action@v0.12.3
        with:
          valueFile: 'helm/oncall/Chart.yaml'
          branch: helm-release/${{ steps.tags.outputs.helm_version }}
          targetBranch: main
          masterBranchName: main
          createPR: 'true'
          description: "Merge this PR to `main` branch to start another 
            [github actions job](https://github.com/grafana/oncall/blob/dev/.github/workflows/helm_release.yml) 
            that will release the updated version of the chart 
            (version: ${{ steps.tags.outputs.helm_version }}, appVersion: ${{ steps.tags.outputs.app_version }}) 
            into `grafana/helm-charts` helm repository. \n\n
            This PR was created automatically by this 
            [github action](https://github.com/grafana/oncall/blob/dev/.github/workflows/helm_release_pr.yml)."
          message: 'Release oncall Helm chart ${{ steps.tags.outputs.helm_version }}'
          changes: |
            {
              "version": "${{ steps.tags.outputs.helm_version }}",
              "appVersion": "${{ steps.tags.outputs.app_version }}"
            }