GitHub Action which validates YAML/JSON files against a JSON schema

jobs:
  validate-github-actions-workflows:
    name: Validate GitHub Actions workflows
    permissions:
      contents: read
    runs-on: ubuntu-latest
    steps:
      - name: Check for any changed workflows
        id: check-for-changed-workflows
        uses: tj-actions/changed-files@v41
        with:
          files: |
            .github/workflows/**.yml
      - name: Validate workflows
        if: steps.check-for-changed-workflows.outputs.any_changed == 'true'
        uses: dsanders11/json-schema-validate-action
        with:
          schema: https://json.schemastore.org/github-workflow.json
          files: .github/workflows/**.yml 

Schemas can be validated by setting the schema input to the string literal json-schema.

By default the action will cache remote schemas (this can be disabled via the cache-remote-schema input). If you need to bust this cache for any reason, simply set a URL fragment (e.g. #bust-cache) on the schema URL.

• schema - (required) URL or file path to JSON schema to validate against
• files - (required) Multiline input of file paths to validate - supports globs
• fail-on-invalid - Whether or not to set action failure if a file is invalid (default: true)
• cache-remote-schema - Whether or not to cache the schema if remote (default: true)

• valid - true if all files are valid, otherwise false

MIT