name: Release Helm Charts

on:
  push:
    branches:
      - release
    paths:
      - '.github/workflows/helm-release.yaml'
      - 'charts/**'

jobs:
  release:
    runs-on: ubuntu-22.04

    permissions:
      contents: write
      packages: write
      id-token: write

    steps:
      - name: Checkout
        uses: actions/checkout@v6.0.3
        with:
          fetch-depth: 0

      - name: Configure Git
        run: |
          git config user.name "$GITHUB_ACTOR"
          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"

      - name: Setup cosign
        uses: sigstore/cosign-installer@v4.1.2
        with:
          cosign-release: v2.2.3

      - name: Set up Helm
        uses: azure/setup-helm@v5
        with:
          version: v3.10.3

      - name: Add required Helm repos for release packaging
        run: |
          helm repo add smallstep https://smallstep.github.io/helm-charts/

      - name: Run chart-releaser
        uses: helm/chart-releaser-action@v1.7.0
        env:
          CR_TOKEN: '${{ secrets.GITHUB_TOKEN }}'

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4.2.0
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Push charts to GHCR and sign
        # when filling gaps with previously released charts, cr would create
        # nothing in .cr-release-packages/, and the original globbing character
        # would be preserved, causing a non-zero exit. Set nullglob to fix this
        run: |
          shopt -s nullglob
          for pkg in .cr-release-packages/*; do
            if [ -z "${pkg:-}" ]; then
              break
            fi
            helm push "${pkg}" oci://ghcr.io/"${GITHUB_REPOSITORY_OWNER}"/helm-charts |& tee .digest
            file="${pkg##*/}"       # extracts file name from full directory path
            name="${file%-*}"       # extracts chart name from filename
            digest="$(awk -F "[, ]+" '/Digest/{print $NF}' < .digest)"
            cosign sign ghcr.io/"${GITHUB_REPOSITORY_OWNER}"/helm-charts/"${name}"@"${digest}"
          done
        env:
          COSIGN_YES: true