action.yaml

name: Publish Helm Chart
description: Package and publish Helm chart to an OCI registry
inputs:
  registry:
    description: The OCI registry to publish to
    required: true
  repository:
    description: The repository within the registry to publish to
    required: true
  username:
    description: Username used to authenticate with the registry
    required: true
  password:
    description: Password used to authenticate with the registry
    required: true
outputs:
  chart:
    description: The published chart including the tag
    value: ${{steps.publish.outputs.pushed}}
runs:
  using: composite
  steps:
    - name: Generate metadata
      id: meta
      shell: bash
      run: |
        echo "ociEndpoint=oci://${{inputs.registry}}/${{inputs.repository}}/" >> "$GITHUB_OUTPUT"
    - name: Install Helm
      uses: azure/setup-helm@v3
      with:
        version: 3.9.0
    - name: Install yq
      shell: bash
      run: |
        sudo wget -O /usr/local/bin/yq 'https://github.com/mikefarah/yq/releases/download/v4.27.2/yq_linux_amd64'
        sudo chmod +x /usr/local/bin/yq
    - name: Add dependency Helm repositories
      shell: bash
      run: |
        i=0
        for url in $(yq '.dependencies[].repository' Chart.yaml); do
          [ "${url:0:6}" != "oci://" ] \
            && helm repo add "repo$i" "$url"
          i=$((i+1))
        done
    - name: Authenticate Helm with the registry
      shell: bash
      run: |
        printf "%s" '${{inputs.password}}' | helm registry login \
          --password-stdin \
          --username '${{inputs.username}}' \
          "${{inputs.registry}}"
    - name: Build dependencies
      shell: bash
      run: helm dependency build
    - name: Package Helm chart
      id: package
      shell: bash
      run: |
        version="${GITHUB_REF_NAME#v}"
        tarball="$(helm package . --version "$version" | sed -r 's/^[^:]+:\s+//')"
        echo "tarball=$tarball" >> "$GITHUB_OUTPUT"
    - name: Publish Helm chart
      id: publish
      shell: bash
      run: |
        helm push "${{steps.package.outputs.tarball}}" "${{steps.meta.outputs.ociEndpoint}}" | sed 's/^\([^:]*\):\s*/\L\1=/' >> "$GITHUB_OUTPUT"