Helm Lint Action

A GitHub Action that lints and tests Helm charts using the chart-testing tool.

Description

This composite action validates Helm charts by linting their structure and installing them on a kind cluster. It only processes charts that have changed compared to the target branch.

Usage

- name: Lint and Test Charts
  uses: ./.github/actions/helm-lint-action
  with:
    target-branch: main

Inputs

Example Workflow

name: Helm Chart CI

on:
  pull_request:
  push:
    branches:
      - main

jobs:
  lint-test:
    runs-on: ubuntu-latest
    steps:
      - name: Lint and test Helm charts
        uses: ./.github/actions/helm-lint-action
        with:
          target-branch: main

How It Works

The action performs the following steps:

1. Checks out the repository with full git history
2. Sets up Helm and Python (required for chart-testing)
3. Installs the chart-testing CLI tool
4. Detects charts that changed compared to the target branch
5. Lints the changed charts
6. Creates a kind Kubernetes cluster
7. Installs and tests the changed charts on the cluster

Requirements

• Repository must contain valid Helm charts
• Charts should follow Helm best practices for linting to pass

Configuration

For advanced configuration, add a ct.yaml file to your repository root. See the chart-testing documentation for available options.

Dependencies

This action uses the following tools:

• helm/chart-testing-action - Chart testing CLI
• azure/setup-helm - Helm installation
• helm/kind-action - Kind cluster creation